There is a shredder comprising: a chopped apparatus including an insertion opening for inserting wastes, and an exhaust port for discharging chopped wastes; a waste container which is displaceable between a receivable position where to receive the chopped wastes and a non-receivable position where not to receive the chopped wastes; a claw portion provided with the waste container; a shutter, which opens the exhaust port by moving the waste container to the receivable position, and which closes the exhaust port by moving the waste container to the non-receivable position; a lock member, which is displaceable between a locked position where to close the shutter and an unlocked position where to make the shutter movable; and an operation lever which displaces the lock member to the unlocked position with the claw portion.