An air conditioner is disclosed, which is suitable for improving its configuration and facilitating its assembly. The present invention includes a cabinet via which air is sucked or blown, a shroud guiding an air flow within the cabinet, a motor provided within the cabinet to forcibly circulate the air within the cabinet, an air guide penetrated by a rotational shaft of the motor, and a motor mounter coupled to the shroud to securely mount the motor thereon. Accordingly, the assembly configuration is simple and the corresponding assembly process is convenient, the vibration of the motor can be minimized, the assembly is facilitated, and the migration of the cold or hot air can be securely cut off.