diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/ErrorResponse.java b/src/main/java/com/com/cnu/devlog_springboot/model/ErrorResponse.java
new file mode 100644
index 0000000..d4a02fa
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/model/ErrorResponse.java
@@ -0,0 +1,26 @@
+package com.com.cnu.devlog_springboot.model;
+
+public record ErrorResponse(String title, Integer status, Integer code, String instance) {
+    public ErrorResponse(String title, Integer status, Integer code, String instance) {
+        this.title = title;
+        this.status = status;
+        this.code = code;
+        this.instance = instance;
+    }
+
+    public String title() {
+        return this.title;
+    }
+
+    public Integer status() {
+        return this.status;
+    }
+
+    public Integer code() {
+        return this.code;
+    }
+
+    public String instance() {
+        return this.instance;
+    }
+}
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/Project.java b/src/main/java/com/com/cnu/devlog_springboot/model/Project.java
index 29d0b72..b8661b3 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/model/Project.java
+++ b/src/main/java/com/com/cnu/devlog_springboot/model/Project.java
@@ -22,4 +22,65 @@ public class Project {
     String contents;
     LocalDate startDate;
     LocalDate endDate;
+
+    public Integer getId() {
+        return this.id;
+    }
+
+    public String getTitle() {
+        return this.title;
+    }
+
+    public String getSummary() {
+        return this.summary;
+    }
+
+    public String getContents() {
+        return this.contents;
+    }
+
+    public LocalDate getStartDate() {
+        return this.startDate;
+    }
+
+    public LocalDate getEndDate() {
+        return this.endDate;
+    }
+
+    public void setId(final Integer id) {
+        this.id = id;
+    }
+
+    public void setTitle(final String title) {
+        this.title = title;
+    }
+
+    public void setSummary(final String summary) {
+        this.summary = summary;
+    }
+
+    public void setContents(final String contents) {
+        this.contents = contents;
+    }
+
+    public void setStartDate(final LocalDate startDate) {
+        this.startDate = startDate;
+    }
+
+    public void setEndDate(final LocalDate endDate) {
+        this.endDate = endDate;
+    }
+
+    public Project(final Integer id, final String title, final String summary, final String contents, final LocalDate startDate, final LocalDate endDate) {
+        this.id = id;
+        this.title = title;
+        this.summary = summary;
+        this.contents = contents;
+        this.startDate = startDate;
+        this.endDate = endDate;
+    }
+
+    protected Project() {
+    }
 }
+
diff --git a/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java b/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java
index 2ae3a17..a004e3a 100644
--- a/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java
+++ b/src/main/java/com/com/cnu/devlog_springboot/model/request/ProjectRequest.java
@@ -9,4 +9,31 @@ public record ProjectRequest(
         LocalDate startDate,
         LocalDate endDate
 ) {
+    public ProjectRequest(String title, String summary, String contents, LocalDate startDate, LocalDate endDate) {
+        this.title = title;
+        this.summary = summary;
+        this.contents = contents;
+        this.startDate = startDate;
+        this.endDate = endDate;
+    }
+
+    public String title() {
+        return this.title;
+    }
+
+    public String summary() {
+        return this.summary;
+    }
+
+    public String contents() {
+        return this.contents;
+    }
+
+    public LocalDate startDate() {
+        return this.startDate;
+    }
+
+    public LocalDate endDate() {
+        return this.endDate;
+    }
 }
diff --git a/src/main/java/com/com/cnu/devlog_springboot/type/ErrorCode.java b/src/main/java/com/com/cnu/devlog_springboot/type/ErrorCode.java
new file mode 100644
index 0000000..c6fa206
--- /dev/null
+++ b/src/main/java/com/com/cnu/devlog_springboot/type/ErrorCode.java
@@ -0,0 +1,26 @@
+package com.com.cnu.devlog_springboot.type;
+
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+public enum ErrorCode {
+    POST_NOT_FOUND(
+            HttpStatus.NOT_FOUND,
+            4000,
+            "해당 게시글을 찾을 수 없습니다."
+    ), PROJECT_NOT_FOUND(
+            HttpStatus.NOT_FOUND,
+            404,
+            "해당 프로젝트를 찾을 수 없습니다."
+    );
+    private final HttpStatus httpStatus;
+    private final Integer errorCode;
+    private final String description;
+
+    ErrorCode(HttpStatus httpStatus, Integer errorCode, String description) {
+        this.httpStatus = httpStatus;
+        this.errorCode = errorCode;
+        this.description = description;
+    }
+}
\ No newline at end of file