An apparatus supplying motive force to a motion device, the apparatus having a brushless electric motor, the electric motor being configured to rotate a rotating shaft by a supplied current, the apparatus comprising: a control board which is positioned relative to the electric motor and on which electronic components for controlling the electric motor are mounted; a casing in which the electric motor is housed; a cover attached to the casing, the cover supporting the control board; a worm formed on an outer periphery of the rotating shaft; and a worm wheel which is housed in the casing, the worm wheel having a worm gear which is engaged with the worm; a plurality of first terminals (58, 59, 60) mounted on the control board, the first terminals carrying a current; a plurality of second terminals (44, 45, 46) which are connected to the respective first terminals, the second terminals carrying a current, the second terminals being disposed outside the rotating shaft in a radial direction of the rotating shaft; and a terminal holder positioned to the casing, the terminal holder supporting the second terminals, wherein the plurality of second terminals are arranged along a circumferential direction of the rotating shaft, and are disposed at respective positions different from each other in a direction along a rotation axis of the worm wheel, the casing has a first recessed portion opened toward the cover, the worm wheel being housed in the first recessed portion, the casing has a second recessed portion opened toward the electric motor, a through-hole being formed between the first and second recessed portions, the terminal holder has: a cylindrical portion housed in the second recessed portion; characterized in that the terminal holder also has an arcuate projecting portion integrally provided to the cylindrical portion, projecting into the first recessed portion from the second recessed portion, and disposed through the through-hole along the circumferential direction of the rotating shaft, the plurality of first terminals each have a first leg portion (58a, 59a, 60a), a second leg portion (58b, 59b, 60b), and a connecting portion (58c, 59a, 60c) connecting the first and second leg portions, are each shaped symmetrically with respect to the respective connecting portions in a plan view, and are each integrally molded so that the first and second leg portions extend in a direction along the rotation axis, the projecting portion has terminal holding slots (37, 38, 39) which penetrate the projecting portion in a direction along the rotation axis, the plurality of second terminals (44, 45, 46) are disposed in the terminal holding slots (37, 38, 39), and the first leg portions are fixed to the control board; and the second leg portions are disposed outside an edge of the control board, are placed in the terminal holding slots, and are connected to each of the second terminals in the terminal holding slots. a control board which is positioned relative to the electric motor and on which electronic components for controlling the electric motor are mounted; a casing in which the electric motor is housed; a cover attached to the casing, the cover supporting the control board; a worm formed on an outer periphery of the rotating shaft; and a worm wheel which is housed in the casing, the worm wheel having a worm gear which is engaged with the worm; a plurality of first terminals (58, 59, 60) mounted on the control board, the first terminals carrying a current; a plurality of second terminals (44, 45, 46) which are connected to the respective first terminals, the second terminals carrying a current, the second terminals being disposed outside the rotating shaft in a radial direction of the rotating shaft; and a terminal holder positioned to the casing, the terminal holder supporting the second terminals, the plurality of second terminals are arranged along a circumferential direction of the rotating shaft, and are disposed at respective positions different from each other in a direction along a rotation axis of the worm wheel, the casing has a first recessed portion opened toward the cover, the worm wheel being housed in the first recessed portion, the casing has a second recessed portion opened toward the electric motor, a through-hole being formed between the first and second recessed portions, the terminal holder has: a cylindrical portion housed in the second recessed portion; the plurality of first terminals each have a first leg portion (58a, 59a, 60a), a second leg portion (58b, 59b, 60b), and a connecting portion (58c, 59a, 60c) connecting the first and second leg portions, are each shaped symmetrically with respect to the respective connecting portions in a plan view, and are each integrally molded so that the first and second leg portions extend in a direction along the rotation axis, the projecting portion has terminal holding slots (37, 38, 39) which penetrate the projecting portion in a direction along the rotation axis, the plurality of second terminals (44, 45, 46) are disposed in the terminal holding slots (37, 38, 39), and the first leg portions are fixed to the control board; and the second leg portions are disposed outside an edge of the control board, are placed in the terminal holding slots, and are connected to each of the second terminals in the terminal holding slots.