A rhythmic device that can be used on a bearing member includes a motor, an eccentric wheel, a first belt pulley, a first belt, and a restoring mechanism. The motor and the eccentric wheel are arranged on a fixing base of the bearing member, and the eccentric wheel can be connected to the motor and driven by the motor to rotate with its eccentric shaft. The first belt pulley is arranged on a rhythmic base of the bearing member, the first belt surrounds the eccentric wheel and the first belt pulley so as to link the eccentric wheel and the first belt pulley, and the restoring mechanism is arranged on the rhythmic base. When the eccentric wheel is driven by the motor to rotate, the first belt pulley and the rhythmic base connected with the first belt pulley can be driven by the motor, and the restoring mechanism provides a restoring force to the rhythmic base in response to the above operation. Accordingly, the rhythmic device can cause the bearing member to generate a reciprocating rhythmic effect.一種可用於承載件上之律動裝置，其包含馬達、偏心輪、第一皮帶輪、第一皮帶以及回復機構。馬達及偏心輪設置於承載件的固定基座上，偏心輪可連接馬達並受馬達驅動而以其偏心軸進行旋轉。第一皮帶輪設置於承載件之律動基座上，第一皮帶則環繞偏心輪及第一皮帶輪使兩者連動，回復機構設於律動基座上。當偏心輪受馬達驅動而轉動時，第一皮帶輪及第一皮帶輪所連接的律動基座可受其連動，回復機構則對應上述連動而對律動基座提供回復力。藉此，律動裝置可令承載件產生往復律動效果。
