A denture system comprising: abutments coupled to the fixtures； and a denture to be detachably attached to the abutments, the denture including: a denture base； an artificial tooth supported by the denture base； a plurality of engagement piece members defining slits extending in the up-down direction； and a lid portion connecting end portions of the engagement piece members as well as closing one end of fitting hole in the up-down direction and covering an entire surface of the tip of the abutment, wherein the lid portion configures a part of the denture base, the piece member has a first surface and a second surface, and a grooved allowance portion is provided allowing the piece member to deform and spread in direction from the first surface toward the second surface.
