A component mounting system configured to pick up a component supplied from a component supply device, wherein the supplied component has a reference direction, and to mount the component on a target object, the component mounting system comprising: multiple suction nozzles (44; 44a-44d), each capable of picking up the component; a rotary head configured to hold the multiple suction nozzles (44; 44a-44d) in a circumferential direction, and to be capable of revolving each suction nozzle (44; 44a-44d) in the circumferential direction and simultaneously spinning each suction nozzle (44; 44a-44d); and a lifting and lowering device configured to lift and lower a suction nozzle (44; 44a-44d) at a predetermined revolving position, among the multiple suction nozzles (44; 44a-44d); a storage device configured to store any one of multiple pieces of directionality information in association with identification information of the suction nozzle (44; 44a-44d), wherein the directionality information is information defining a direction of each suction nozzle in which the component can be mounted with respect to the reference direction of the supplied component, the multiple pieces of directionality information including at least: - no directionality in which the component supplied from the component supply device is able to be picked up at any spinning position, - one direction in which the component supplied from the component supply device is able to be picked up only at one specific spinning position, - two directions in which the component supplied from the component supply device is able to be picked up only at any one of two specific spinning positions, and - four directions in which the component supplied from the component supply device is able to be picked up only at any one of four specific spinning positions; and a control device configured to acquire the identification information of the suction nozzle (44; 44a-44d) used in picking up the component, to acquire the corresponding directionality information from the storage device based on the acquired identification information, and to control the head and the suction nozzle (44; 44a-44d) such that the component supplied from the component supply device is picked up at the spinning position in accordance with the acquired directionality information. multiple suction nozzles (44; 44a-44d), each capable of picking up the component; a rotary head configured to hold the multiple suction nozzles (44; 44a-44d) in a circumferential direction, and to be capable of revolving each suction nozzle (44; 44a-44d) in the circumferential direction and simultaneously spinning each suction nozzle (44; 44a-44d); and a lifting and lowering device configured to lift and lower a suction nozzle (44; 44a-44d) at a predetermined revolving position, among the multiple suction nozzles (44; 44a-44d); a storage device configured to store any one of multiple pieces of directionality information in association with identification information of the suction nozzle (44; 44a-44d), wherein the directionality information is information defining a direction of each suction nozzle in which the component can be mounted with respect to the reference direction of the supplied component, the multiple pieces of directionality information including at least: - no directionality in which the component supplied from the component supply device is able to be picked up at any spinning position, - one direction in which the component supplied from the component supply device is able to be picked up only at one specific spinning position, - two directions in which the component supplied from the component supply device is able to be picked up only at any one of two specific spinning positions, and - four directions in which the component supplied from the component supply device is able to be picked up only at any one of four specific spinning positions; and - no directionality in which the component supplied from the component supply device is able to be picked up at any spinning position, - one direction in which the component supplied from the component supply device is able to be picked up only at one specific spinning position, - two directions in which the component supplied from the component supply device is able to be picked up only at any one of two specific spinning positions, and - four directions in which the component supplied from the component supply device is able to be picked up only at any one of four specific spinning positions; and a control device configured to acquire the identification information of the suction nozzle (44; 44a-44d) used in picking up the component, to acquire the corresponding directionality information from the storage device based on the acquired identification information, and to control the head and the suction nozzle (44; 44a-44d) such that the component supplied from the component supply device is picked up at the spinning position in accordance with the acquired directionality information.