There are provided: a main body portion (1) that has a flat shape and is configured to be attached to a back of an operator so as to extend along the back； a load operating portion (3) that extends forward from the main body portion (1) across the operator to hold a load； a lifting/lowering device (M1) that drives to lift and lower the load operating portion (3)； a control device (C) that controls lifting/lowering driving that is performed by the lifting/lowering device (M1)； and a power supply device (V) for driving. The lifting/lowering device (M1), the control device (C) and the power supply device (V) are provided on the main body portion (1) so as to be aligned along a flat surface of the main body portion (1).
