A driving module (300, 300', 400) comprising: a driving source (320, 420) configured to transmit power; an input side rotary body (330, 330', 430) connected to the driving source (320, 420) and configured to rotate; and a first decelerator (340, 440) and a second decelerator (360, 460) configured to operate using the power received from the driving source (320, 420) through the input side rotary body (330, 330', 430), wherein a gear ratio from the input side rotary body (330, 330', 430) to the output terminal of the first decelerator (330, 440) differs from a gear ratio from the input side rotary body (330, 330', 430) to the output terminal of the second decelerator (360, 460), and the first decelerator (340, 440) comprises a first planet gear (342, 342', 442), a first carrier (344, 444), a first ring gear (346, 446), and a first pulley (348, 448), and the second decelerator (360, 460) comprises a second planet gear (362, 362', 462), a second carrier (364, 464), a second ring gear (366, 466), and a second pulley (368, 468), wherein: the first planet gear (342, 342') and second planet gear (362, 362') are fixed together to perform a single rigid body motion and the first ring gear and second ring gear are fixed to the first pulley and second pulley respectively to perform a single rigid body motion; or the first ring gear and second ring gear are fixed together to perform a single rigid body motion and the first carrier and second carrier are fixed to the first pulley and second pulley respectively to perform a single rigid body motion. a driving source (320, 420) configured to transmit power; an input side rotary body (330, 330', 430) connected to the driving source (320, 420) and configured to rotate; and a first decelerator (340, 440) and a second decelerator (360, 460) configured to operate using the power received from the driving source (320, 420) through the input side rotary body (330, 330', 430), wherein a gear ratio from the input side rotary body (330, 330', 430) to the output terminal of the first decelerator (330, 440) differs from a gear ratio from the input side rotary body (330, 330', 430) to the output terminal of the second decelerator (360, 460), and the first decelerator (340, 440) comprises a first planet gear (342, 342', 442), a first carrier (344, 444), a first ring gear (346, 446), and a first pulley (348, 448), and the second decelerator (360, 460) comprises a second planet gear (362, 362', 462), a second carrier (364, 464), a second ring gear (366, 466), and a second pulley (368, 468), wherein: the first planet gear (342, 342') and second planet gear (362, 362') are fixed together to perform a single rigid body motion and the first ring gear and second ring gear are fixed to the first pulley and second pulley respectively to perform a single rigid body motion; or the first ring gear and second ring gear are fixed together to perform a single rigid body motion and the first carrier and second carrier are fixed to the first pulley and second pulley respectively to perform a single rigid body motion. the first planet gear (342, 342') and second planet gear (362, 362') are fixed together to perform a single rigid body motion and the first ring gear and second ring gear are fixed to the first pulley and second pulley respectively to perform a single rigid body motion; or the first ring gear and second ring gear are fixed together to perform a single rigid body motion and the first carrier and second carrier are fixed to the first pulley and second pulley respectively to perform a single rigid body motion.