Creasing device and image forming system

摘要

A creasing device includes: a first member including a creasing blade; a first receiving member including an attachment surface where the first member is to be attached; a second member arranged to face the first member and including a first creasing channel and a second creasing channel opposite to the first creasing channel, the first creasing channel configured to allow the creasing blade to be fitted thereinto with the sheet between the first creasing channel and the creasing blade, the second creasing channel configured to allow the creasing blade to be fitted thereinto with the sheet between the second creasing channel and the creasing blade; a second receiving member including an attachment surface where the second member is to be attached; and a driving section that brings the first and second members into contact with each other and separates the first member and the second member from one another.