Abstract: The present disclosure relates to a substrate transfer device for sensing deflection of an end-effector and a substrate processing apparatus having the same. The substrate transfer device includes: an end-effector extending in a first direction and supporting a substrate; an end-effector hand connected with one side in the first direction of the end-effector; a horizontal movement unit connected with the end-effector hand and moving the end-effector in the first direction; and a deflection sensing unit including a light emitting part and a light receiving part, which are respectively disposed at both sides of a movement path of the end-effector, and sensing deflection of the end-effector.