PROBLEM TO BE SOLVED: To provide a self-winding portable watch. The present invention relates to a self-winding mechanical watch movement (10) including a pivotally vibrating weight (2), wherein the rotary weight is mounted on the rotary weight and driven pivotally by the weight. A decorative disk (1) is provided. According to a preferred embodiment, the disc (1) is fixed to a support (11) including a stem (13) inserted into a hole (15) provided in the rotating shaft (14) of the weight (2). Will be done. Stems and holes include non-circular cross-section cylindrical portions (13a, 15a) that correspond to each other so that the support (11) and disc (1) are driven pivotally by the shaft (14). The disc forms a decoration that covers the entire surface of the movement without the need for complex technical means. According to a preferred embodiment, the disc (1) is such that the disc (2) can be removed from the weight when the watch movement (10) is removed from the portable watch case (18). ) Can be freely moved in the axial direction. [Selection diagram] Fig. 1
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