Patent ID: 8894059

Claim:
A sheet feeding device comprising: a structure as an option, on which an apparatus main body of an image forming apparatus having a lower face with a positioning depression is placed, configured to include: a mounting member located to face to a periphery of the lower face of the apparatus main body; a reinforcement member located below the mounting member; and a positioning pin configured to include an upper part having a guard part and a lower part and to penetrate the mounting member so that the upper part can fit in the positioning depression and the lower part can come into contact with the reinforcement member, wherein the positioning pin is provided with a spring between the mounting member and guard part to bias the positioning pin upward, and when the apparatus main body is placed, in the positioning pin, the upper part fits in the positioning depression, the guard part comes into contact with an edge of the positioning depression and the lower part comes into contact with the reinforcement member.