A band to be attached to a wrist-worn device body including a case, a lug provided at a side face of the case, a pin supported by the lug, and an attachment face, the band including a band body, a coupler body member coupled to an end portion of the band body, the coupler body member being provided with a contact face abuttable against the attachment face and a guide groove into which the pin is insertable, and a fixing member attached to the coupler body member to be movable between a fixing position for biasing the pin, inserted into the guide groove, in a direction away from the attachment face to fix the coupler body member onto the wrist-worn device body, and an attaching-detaching position for enabling insertion of the pin into the guide groove and detachment of the pin inserted into the guide groove.