The present invention relates to a method for performing a random access procedure in a wireless communication system and an apparatus therefor, the method comprising the steps of: receiving a physical downlink control channel (PDCCH) order, which indicates initiation of a random access procedure, from a base station; transmitting a random access preamble to the base station; and receiving a random access response message from the base station, wherein the step of receiving the random access response message comprises receiving downlink data together with the random access response message when the PDCCH order indicates downlink data transmission in Msg2.