A refrigerator comprising: a main body housing; a door configured to rotate about a hinge shaft to open and close the main body housing; a motor configured to output power for opening and closing the door; a power transmission apparatus including a plurality of driving gears and configured to transmit the output power of the motor to the hinge shaft by rotation of the plurality of driving gears; and an auxiliary apparatus configured to generate an auxiliary force for moving the door from a closing position toward an opening position, wherein the auxiliary apparatus receives the output power from the motor and generates the auxiliary force before the output power of the motor is transmitted to the hinge shaft via the power transmission apparatus, wherein the plurality of driving gears include: a door-side gear configured to rotate by moving with opening and closing of the door; a motor-side gear configured to rotate by interlocking with the motor; characterized by a center gear connected to the motor-side gear; and a pair of idler gears configured to be engaged with the center gear and respectively move to a predetermined position, and a swing apparatus configured to rotate together with the pair of idler gears about a rotation axis of the center gear by interlocking with rotation of the center gear in a forward direction or a reverse direction, wherein the pair of idler gears move between a power transmitting position during which the pair of idler gears are engaged with the door-side gear when the center gear rotates in the forward direction or the reverse direction, and a power non-transmitting position during which the pair of idler gears disengaged from the door-side gear when the center gear is at a standstill. a main body housing; a door configured to rotate about a hinge shaft to open and close the main body housing; a motor configured to output power for opening and closing the door; a power transmission apparatus including a plurality of driving gears and configured to transmit the output power of the motor to the hinge shaft by rotation of the plurality of driving gears; and an auxiliary apparatus configured to generate an auxiliary force for moving the door from a closing position toward an opening position, wherein the auxiliary apparatus receives the output power from the motor and generates the auxiliary force before the output power of the motor is transmitted to the hinge shaft via the power transmission apparatus, wherein the plurality of driving gears include: a door-side gear configured to rotate by moving with opening and closing of the door; a motor-side gear configured to rotate by interlocking with the motor; characterized by a center gear connected to the motor-side gear; and a pair of idler gears configured to be engaged with the center gear and respectively move to a predetermined position, and a swing apparatus configured to rotate together with the pair of idler gears about a rotation axis of the center gear by interlocking with rotation of the center gear in a forward direction or a reverse direction, wherein the pair of idler gears move between a power transmitting position during which the pair of idler gears are engaged with the door-side gear when the center gear rotates in the forward direction or the reverse direction, and a power non-transmitting position during which the pair of idler gears disengaged from the door-side gear when the center gear is at a standstill. a door-side gear configured to rotate by moving with opening and closing of the door; a motor-side gear configured to rotate by interlocking with the motor; characterized by a center gear connected to the motor-side gear; and a pair of idler gears configured to be engaged with the center gear and respectively move to a predetermined position, and a swing apparatus configured to rotate together with the pair of idler gears about a rotation axis of the center gear by interlocking with rotation of the center gear in a forward direction or a reverse direction, wherein the pair of idler gears move between a power transmitting position during which the pair of idler gears are engaged with the door-side gear when the center gear rotates in the forward direction or the reverse direction, and a power non-transmitting position during which the pair of idler gears disengaged from the door-side gear when the center gear is at a standstill.