diff --git a/src/application/exceptions/ApplicationExceptions.ts b/src/application/exceptions/ApplicationExceptions.ts
index 86bf68b..e024e66 100644
--- a/src/application/exceptions/ApplicationExceptions.ts
+++ b/src/application/exceptions/ApplicationExceptions.ts
@@ -53,6 +53,14 @@ export class MemberNotFoundFromDiscordAccountIdException extends ApplicationExce
 	}
 }
 
+export class KarteNotFoundException extends ApplicationException {
+	constructor(karteId: string) {
+		const message = `カルテが見つかりません: ${karteId}`;
+		super(message);
+		this.name = "KarteNotFoundException";
+	}
+}
+
 export class DiscordAccountNotConnectedException extends ApplicationException {
 	constructor(userId: string, discordUserId: string) {
 		const message = `ユーザー: ${userId} のDiscordアカウントは紐づいていません: ${discordUserId}`;
diff --git a/src/application/index.ts b/src/application/index.ts
index 46ce8c6..6a2038e 100644
--- a/src/application/index.ts
+++ b/src/application/index.ts
@@ -1,4 +1,5 @@
 export * from "./usecase/member";
 export * from "./usecase/event";
 export * from "./usecase/eventParticipation";
+export * from "./usecase/karte";
 export * from "./exceptions";
diff --git a/src/application/usecase/karte/CorrectKarte.ts b/src/application/usecase/karte/CorrectKarte.ts
new file mode 100644
index 0000000..385696a
--- /dev/null
+++ b/src/application/usecase/karte/CorrectKarte.ts
@@ -0,0 +1,59 @@
+import { KarteNotFoundException } from "#application/exceptions";
+import { IUseCase } from "#application/usecase/base";
+import type { Client } from "#domain/aggregates/karte/Client";
+import type { Consent } from "#domain/aggregates/karte/Consent";
+import type { ConsultationCategory } from "#domain/aggregates/karte/ConsultationCategory";
+import type { FollowUp } from "#domain/aggregates/karte/FollowUp";
+import type { Karte } from "#domain/aggregates/karte/Karte";
+import type { KarteId } from "#domain/aggregates/karte/KarteId";
+import type { KarteRepository } from "#domain/aggregates/karte/KarteRepository";
+import type { WorkDuration } from "#domain/aggregates/karte/WorkDuration";
+import type { MemberId } from "#domain/aggregates/member/MemberId";
+import type { NonEmptyArray } from "#domain/base/NonEmptyArray";
+
+/** 訂正時の解決ステータス */
+type CorrectResolution =
+	| { readonly type: "resolved" }
+	| { readonly type: "unresolved"; readonly followUp: FollowUp };
+
+export type CorrectKarteInput = {
+	readonly karteId: KarteId;
+	readonly consultedAt: Date;
+	readonly client: Client;
+	readonly consent: Consent;
+	readonly consultation: {
+		readonly categories: NonEmptyArray<ConsultationCategory>;
+		readonly targetDevice: string;
+		readonly troubleDetails: string;
+	};
+	readonly supportRecord: {
+		readonly assignedMemberIds: NonEmptyArray<MemberId>;
+		readonly content: string;
+		readonly resolution: CorrectResolution;
+		readonly workDuration: WorkDuration;
+	};
+};
+
+export type CorrectKarteOutput = {
+	readonly karte: Karte;
+};
+
+export class CorrectKarteUseCase extends IUseCase<
+	CorrectKarteInput,
+	CorrectKarteOutput
+> {
+	constructor(private readonly karteRepository: KarteRepository) {
+		super();
+	}
+
+	async execute(input: CorrectKarteInput): Promise<CorrectKarteOutput> {
+		const existing = await this.karteRepository.findById(input.karteId);
+		if (!existing) {
+			throw new KarteNotFoundException(input.karteId);
+		}
+
+		const corrected = existing.correct(input);
+		await this.karteRepository.save(corrected);
+		return { karte: corrected };
+	}
+}
diff --git a/src/application/usecase/karte/CreateKarte.ts b/src/application/usecase/karte/CreateKarte.ts
new file mode 100644
index 0000000..dfa20bd
--- /dev/null
+++ b/src/application/usecase/karte/CreateKarte.ts
@@ -0,0 +1,53 @@
+import { IUseCase } from "#application/usecase/base";
+import type { Client } from "#domain/aggregates/karte/Client";
+import type { Consent } from "#domain/aggregates/karte/Consent";
+import type { ConsultationCategory } from "#domain/aggregates/karte/ConsultationCategory";
+import type { FollowUp } from "#domain/aggregates/karte/FollowUp";
+import { Karte } from "#domain/aggregates/karte/Karte";
+import type { KarteId } from "#domain/aggregates/karte/KarteId";
+import type { KarteRepository } from "#domain/aggregates/karte/KarteRepository";
+import type { WorkDuration } from "#domain/aggregates/karte/WorkDuration";
+import type { MemberId } from "#domain/aggregates/member/MemberId";
+import type { NonEmptyArray } from "#domain/base/NonEmptyArray";
+
+/** 新規カルテ作成時の解決ステータス */
+type CreateResolution =
+	| { readonly type: "resolved" }
+	| { readonly type: "unresolved"; readonly followUp: FollowUp };
+
+export type CreateKarteInput = {
+	readonly id: KarteId;
+	readonly consultedAt: Date;
+	readonly client: Client;
+	readonly consent: Consent;
+	readonly consultation: {
+		readonly categories: NonEmptyArray<ConsultationCategory>;
+		readonly targetDevice: string;
+		readonly troubleDetails: string;
+	};
+	readonly supportRecord: {
+		readonly assignedMemberIds: NonEmptyArray<MemberId>;
+		readonly content: string;
+		readonly resolution: CreateResolution;
+		readonly workDuration: WorkDuration;
+	};
+};
+
+export type CreateKarteOutput = {
+	readonly karte: Karte;
+};
+
+export class CreateKarteUseCase extends IUseCase<
+	CreateKarteInput,
+	CreateKarteOutput
+> {
+	constructor(private readonly karteRepository: KarteRepository) {
+		super();
+	}
+
+	async execute(input: CreateKarteInput): Promise<CreateKarteOutput> {
+		const karte = Karte.create(input);
+		await this.karteRepository.save(karte);
+		return { karte };
+	}
+}
diff --git a/src/application/usecase/karte/GetKarte.ts b/src/application/usecase/karte/GetKarte.ts
new file mode 100644
index 0000000..6c6a85c
--- /dev/null
+++ b/src/application/usecase/karte/GetKarte.ts
@@ -0,0 +1,27 @@
+import { KarteNotFoundException } from "#application/exceptions";
+import { IUseCase } from "#application/usecase/base";
+import type { Karte } from "#domain/aggregates/karte/Karte";
+import type { KarteId } from "#domain/aggregates/karte/KarteId";
+import type { KarteRepository } from "#domain/aggregates/karte/KarteRepository";
+
+export type GetKarteInput = {
+	readonly karteId: KarteId;
+};
+
+export type GetKarteOutput = {
+	readonly karte: Karte;
+};
+
+export class GetKarteUseCase extends IUseCase<GetKarteInput, GetKarteOutput> {
+	constructor(private readonly karteRepository: KarteRepository) {
+		super();
+	}
+
+	async execute(input: GetKarteInput): Promise<GetKarteOutput> {
+		const karte = await this.karteRepository.findById(input.karteId);
+		if (!karte) {
+			throw new KarteNotFoundException(input.karteId);
+		}
+		return { karte };
+	}
+}
diff --git a/src/application/usecase/karte/index.ts b/src/application/usecase/karte/index.ts
new file mode 100644
index 0000000..dc2af18
--- /dev/null
+++ b/src/application/usecase/karte/index.ts
@@ -0,0 +1,6 @@
+export { CreateKarteUseCase } from "./CreateKarte";
+export type { CreateKarteInput, CreateKarteOutput } from "./CreateKarte";
+export { CorrectKarteUseCase } from "./CorrectKarte";
+export type { CorrectKarteInput, CorrectKarteOutput } from "./CorrectKarte";
+export { GetKarteUseCase } from "./GetKarte";
+export type { GetKarteInput, GetKarteOutput } from "./GetKarte";