A motion transmitting device (1, 2, 3, 4, 5, 6, 7, 8, 9, 301, 351, 401) comprising: at least one slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) movable along a slider guide; at least one connecting body (31, 36, 51, 78, 83, 86, 166, 341) movable along a connecting body guide (16, 17, 18, 19, 315, 353, 409), and a holder (11, 12, 71, 72, 98, 162, 303, 403) to accommodate the slider (21, 26, 41, 46, 61, 73) and the connecting body (31, 36, 51, 78, 83, 86, 166, 341); wherein the holder (11, 12, 71, 72, 98, 162, 303, 403), the slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) and the connecting body (31, 36, 51, 78, 83, 86, 166, 341) are formed as one unit, the slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) and the connecting body (31, 36, 51, 78, 83, 86, 166, 341) are disposed in contact with each other, contact surfaces of the slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) and the connecting body (31, 36, 51, 78, 83, 86, 166, 341) are slidable with each other, an amount of displacement and/or a speed of displacement of an output end relative to an input end of the motion transmitting device can be reduced or can be made equal to each other or can be increased through setting of an angle of a center axis line of the slider guide about a center axis line (M 1, M 2, M 3, M 4, M 5) of the connecting body guide (16, 17, 18, 19, 315, 353, 409) and/or an inclination angle of the contact surfaces; characterized in that the slider guide to guide the slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) is provided to form two opposed inner wall surfaces of the holder, the slider guide having a linear shape and/or a curved shape; the connecting body guide (16, 17, 18, 19, 315, 353, 409) to guide the connecting body (31, 36, 51, 78, 83, 86, 166, 341) is provided as a groove (16, 17, 18, 19, 315, 353, 409) or an elongated convex element in another inner wall surface of the holder, and the connecting body (31, 36, 51, 78, 83, 86, 166, 341) has an elongated convex element (37, 84, 87) that slidably engages in the groove (16, 17, 18, 19, 315, 353, 409) or a groove that slidably engages with the elongated convex element of the connecting body guide (16, 17, 18, 19, 315, 353, 409). at least one slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) movable along a slider guide; at least one connecting body (31, 36, 51, 78, 83, 86, 166, 341) movable along a connecting body guide (16, 17, 18, 19, 315, 353, 409), and a holder (11, 12, 71, 72, 98, 162, 303, 403) to accommodate the slider (21, 26, 41, 46, 61, 73) and the connecting body (31, 36, 51, 78, 83, 86, 166, 341); wherein the holder (11, 12, 71, 72, 98, 162, 303, 403), the slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) and the connecting body (31, 36, 51, 78, 83, 86, 166, 341) are formed as one unit, the slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) and the connecting body (31, 36, 51, 78, 83, 86, 166, 341) are disposed in contact with each other, contact surfaces of the slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) and the connecting body (31, 36, 51, 78, 83, 86, 166, 341) are slidable with each other, an amount of displacement and/or a speed of displacement of an output end relative to an input end of the motion transmitting device can be reduced or can be made equal to each other or can be increased through setting of an angle of a center axis line of the slider guide about a center axis line (M 1, M 2, M 3, M 4, M 5) of the connecting body guide (16, 17, 18, 19, 315, 353, 409) and/or an inclination angle of the contact surfaces; characterized in that the slider guide to guide the slider (21, 26, 41, 46, 61, 85, 88, 94, 96, 165, 167, 321, 331) is provided to form two opposed inner wall surfaces of the holder, the slider guide having a linear shape and/or a curved shape; the connecting body guide (16, 17, 18, 19, 315, 353, 409) to guide the connecting body (31, 36, 51, 78, 83, 86, 166, 341) is provided as a groove (16, 17, 18, 19, 315, 353, 409) or an elongated convex element in another inner wall surface of the holder, and the connecting body (31, 36, 51, 78, 83, 86, 166, 341) has an elongated convex element (37, 84, 87) that slidably engages in the groove (16, 17, 18, 19, 315, 353, 409) or a groove that slidably engages with the elongated convex element of the connecting body guide (16, 17, 18, 19, 315, 353, 409).