A watch case for a wristwatch including a watch middle, at least one strut for supporting the watch middle, the strut extending beyond the space occupied by the watch middle, a device for removably attaching a watch strap to the strut. The watch case further includes a member for fixing the strut or one of the struts to the watch middle, the removable attachment device being formed when the strut is fixed to the watch middle, and the fixing member includes a device for detaching the strut from the watch middle, configured to allow release of the strut from the watch middle without using tools, the strut being removably fixed to the watch middle.