Provided are a method and a device for enabling HARQ feedback information to be transmitted in response to the reception of a downlink data channel in the unlicensed band. The method may include: receiving downlink control information including resource allocation information for a downlink data channel (PDSCH) in an unlicensed band; receiving HARQ timing indication information for transmitting HARQ feedback information in the unlicensed band; and transmitting the HARQ feedback information in the unlicensed band according to the HARQ timing indication information.