A cutting apparatus includes a cutting device and a base section. The cutting device includes a motor, a housing, a circular saw blade, and a base plate. The circular saw blade is driven by the motor to cut a workpiece. The housing rotatably supports the circular saw blade and accommodates the motor. The base plate is connected with the housing and is formed with an opening into which the circular saw blade is inserted. The base plate includes a main base plate connected with the housing and a sub base plate detachably mounted on the main base plate. The base section supports the workpiece. The cutting device is detachably mounted on the base section and is pivotably supported by the base section to be moved toward and away from the base section to cut the workpiece.