Patent ID: 8851467

Claim:
A recording material feed cassette comprising: a first cassette portion; a second cassette portion that is assembled with the first cassette portion so as to be capable of extending in an extension direction and retracting in a retraction direction relative to the first cassette portion and that, along with the first cassette portion, contains a recording material; and a locking mechanism that fixes the position of the second cassette portion relative to the first cassette portion, wherein the locking mechanism is provided in a base of the second cassette portion and wherein the locking mechanism includes: a lock portion capable of moving in a first direction that is orthogonal to the extension direction and to the retraction direction so as to take on a locked position and an unlocked position; an operation portion that is provided in the second cassette portion and that is capable of moving in a second direction that follows the extension direction and the retraction direction; and a connection portion that connects the lock portion and the operation portion and that is capable of deforming as a result of the movement of the lock portion in the first direction, wherein the connection portion includes: a filament member whose one end is connected to the lock portion and whose other end is connected to the operation portion; and a curved surface portion that changes the direction in which the filament member extends from the operation portion from the second direction to the first direction.