US Patent 11789409 Case, timepiece and fastening member

An example case includes a case main body having a first insertion hole; a first exterior case having a second insertion hole coaxially corresponding to the first insertion hole and arranged on an upper part of the case main body; and a fastening member having a fixing portion to be fixed in the first insertion hole and a fitting portion to be fitted into the second insertion hole, the fitting portion being fitted into the second insertion hole while deforming a portion of the fitting portion to be fitted into the second insertion hole, wherein the fixing portion of the fastening member fixed in the first insertion hole includes a press fitting portion press-fitted into the first insertion hole, and wherein the press fitting portion of the fastening member includes a biting portion which bites into an inner circumferential surface of the first insertion hole of the case main body.