Buckle, in particular belt buckle

A buckle, comprising:

• a first buckle part including a first buckle main body and a receptacle which is hook-shaped, as seen in at least one section, and formed rigidly on the first buckle main body;
• a second buckle part including a second buckle main body with a hook-in part that is inherently rigid for hooking into the receptacle of the first buckle part;
• a bolt on the first buckle part, the bolt having a locking position and an unlocking position, and the hook-in part, in a state when hooked into the receptacle in the locking position of the bolt, is retained in the receptacle by at least one retaining surface of the bolt and, in the unlocking position of the bolt, is removable from the receptacle;
• the hook-in part has a central web and two side parts protruding on mutually opposite sides from the central web, and each of the side parts is delimited by a respective front edge, and the front edges of the side parts are oriented running obliquely away from each other at least regionally from a direction of the central web, wherein the side parts of the hook-in part contact a rigid wall of the receptacle that extends up from a bottom wall of the receptacle in a hooked-in position.