A pressing member pressed against a sheet stack portion can be moved to both a retracting portion where alignment of the sheet by the aligning portion is not prevented and a pressing position where the aligned sheet S1 is pressed against the sheet stack portion. Here, the controller generates the command value in correspondence with steering state of wheels, thereby controlling torque or rotation number of the electric motor. The semiconductor chip has a plurality of bonding pads electrically coupled to the inner lead portions of the L-shaped leads. The shell 305 restrains the tank 301 and compresses elastic sealing members 305 to sealingly engage the cylindrical member 302 and the side wall plate 303 with each other. The current collector for a flexible electrode includes: a flexible polymer substrate; a cross-linkable polymer layer disposed on the polymer substrate; and a metal layer disposed on the cross-linkable polymer layer, wherein the surface of the cross-linkable polymer layer includes a plurality of protrusions and grooves. The output member encounters resistance during the brake application that is defined by a reaction force transmitted through a disc.