A cooking appliance may include a cabinet with a cavity that defines a cooking space, an upper panel disposed above the cavity and that is configured to define an upper appearance of the cooking appliance, a front panel disposed in front of the cavity and that is configured to define a front appearance of the cooking appliance, a door that is configured to open and close the cavity, a side panel that is disposed on a side of the cavity and that is configured to define a side appearance of the cooking appliance, a rear panel that is disposed behind the cavity and that is configured to define a rear appearance of the cooking appliance, and a frame bracket that is mounted to a front upper portion of the cabinet and that is configured to secure the upper and front panels to the cabinet.