DragTest-2D

//ドラッグで動かしたいオブジェクトにアタッチ
using UnityEngine;
public class DragTest : MonoBehaviour
{
    Vector2 startPos;
    Vector2 screenPos;
    Vector2 worldPos;
    // Start is called before the first frame update
    void Start()
    {       
    }
    void Update()
    {
     if (Input.GetMouseButton(0))
        {
     startPos = transform.position;
    screenPos = Input.mousePosition;
    worldPos = Camera.main.ScreenToWorldPoint(screenPos);
    float timer = 0.01f;
    timer += Time.deltaTime;
   transform.position = Vector3.Lerp(startPos, worldPos, timer);
      }
    }
}
/////////////////////////////////////

//MainCameraにPysics2DRaycasterをアタッチ
//EventSystemをシーンに配置
//ドラッグで動かしたいオブジェクトに
//以下のスクリプトとCollider2Dをアタッチ

using UnityEngine;
using UnityEngine.EventSystems;
//CameraのProjectionはOrthographicに。

public class DragEvent : MonoBehaviour, IDragHandler
{
    public void OnDrag(PointerEventData data)
    {
        Vector3 TargetPos = Camera.main.ScreenToWorldPoint(data.position);
        TargetPos.z = 0;
        transform.position = TargetPos;
    }
}
/////////////////////////////////////
 //  Collider2D
using UnityEngine;

public class DragAndDrop : MonoBehaviour
{
    bool canMove;
    bool dragging;
     private new Collider2D collider;
 //    Collider2D collider;
    void Start()
    {
        collider = GetComponent();
        canMove = false;
        dragging = false;
    }
    void Update()
    {
    Vector2 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        if (Input.GetMouseButtonDown(0) || Input.touchCount == 1)
        {
            if (collider == Physics2D.OverlapPoint(mousePos))
            {
                canMove = true;
            }
            else
            {
                canMove = false;
            }
            if (canMove)
            {
                dragging = true;
            }
        }
        if (dragging)
      {
          this.transform.position = mousePos;
      }
        if (Input.GetMouseButtonUp(0) || Input.touchCount <= 0)
      {
         canMove = false;
         dragging = false;
      }
    }
}