An oven includes a rear panel that is located at a rear side of a cavity of the oven, a first tray frame configured to support an oven tray located in the cavity, a guide part that is located at a front surface of the rear panel at lateral sides of the rear panel, a moving rack comprising guide connection parts configured to engage with the guide part and a first frame connecting part configured to connect to the first tray frame, the moving rack being configured to move up and down along the guide part, and a rear cover that is located between the oven tray and the rear panel and that covers a first space accommodating the guide part from a second space accommodating the oven tray. At least a portion of the first frame connecting part is exposed outside of the rear cover.