Waste toner collecting device and image forming apparatus

A waste toner collecting device that collects waste toner discharged from a waste toner discharging unit of an apparatus body, comprising:

• a waste toner container including, at an upper portion thereof, an opening that receives the waste toner;
• and
• a shutter mechanism that is disposed above the opening and that opens or closes the opening,
• wherein the shutter mechanism includes
• a cylindrical receiving portion including, at one end, an insertion port through which the waste toner discharging unit is inserted, the receiving portion having an inner space connected with an inner space of the waste toner container through the opening,
• a shutter member having a cylinder shape extending along an inner circumferential surface of the receiving portion, the shutter member being disposed in the receiving portion to be movable between an open position, in which the shutter member opens the opening, and a closing position, in which the shutter member closes the opening, and
• an urging member that urges the shutter member to the closing position, and
• wherein the shutter member includes a ridge on an upper portion of an outer circumferential surface of the shutter member, the ridge having a protrusion height corresponding to a gap between the outer circumferential surface and an inner circumferential surface of the receiving portion.