A component mounting machine includes a tool station and a determination section. The tool station detachably accommodates a holding member including a main body section which can hold a component to be mounted on a board and multiple identification sections which can identify multiple accommodation angles. The determination section determines an angle difference in which the accommodation angle of the holding member differs from a predetermined accommodation angle. At least one identification section of the multiple identification sections is defined as a first identification section, the at least one identification section being exposed when the accommodation angle of the holding member is the predetermined accommodation angle in a close state in which the multiple identification sections are partially covered by a shielding member. When the determination section cannot recognize the first identification section in the close state, the determination section attempts to recognize a second identification section.