A storage device attachment and detachment structure comprising a holding member configured to hold a storage device with a storage medium, and a pressure member including a biasing portion that has an end portion connected to the holding member, the biasing portion being configured to contact the storage device to press the storage device in a biasing direction toward the holding member, the pressure member being movable to a pressure release position in which the pressure member is separated from the storage device in an opposite direction of the biasing direction to release pressure relative to the storage device.