To provide a post-processing device capable of suppressing the bulkiness of a booklet bundle filed by a ring binder even though a plurality of booklets where paper bundles are filed by a ring binder are further filed into a booklet bundle.

The post-processing device including a first drilling means that drills a first hole in the paper for filing a paper bundle into a booklet that is provided in a conveyance path of the paper, a second drilling means that drills a second hole in the paper for filing a plurality of booklets into a booklet bundle that is provided in the conveyance path of the paper, and a control section that controls the drilling of the first drilling means and the second drilling means is provided.