To provide stress relieving equipment which can remove stress easily.

The stress relieving equipment 3 includes a heating device 8 for heating a wall surface to relieve stress generated during welding, and a supporting device 18 for supporting the heating device so as to direct the heating unit to the wall surface. The supporting device comprises a vertical movement mechanism 7 to move the heating device in the vertical direction and a horizontal movement mechanism 4 to move the heating device in the horizontal direction.