An electronic circuit component mounting device comprising: a circuit substrate holding device that detachably holds a circuit substrate; a bulk feeder that includes (a) a component storage portion storing electronic circuit components in bulk and (b) a component feed portion aligning the electronic circuit components, which are stored in the component storage portion, in a guide passage in a line and feeding the electronic circuit components to a component supply section; a mounting device that includes (a) a suction nozzle sucking and holding the electronic circuit component by negative pressure, (b) a suction-negative pressure control valve controlling the supply of component suction-negative pressure to the suction nozzle, and (c) a nozzle lifting and lowering device (128, 130) lifting and lowering the suction nozzle, and takes the electronic circuit components out of the component supply section of the bulk feeder one by one by the suction nozzle and mounts the electronic circuit component on the circuit substrate held by the circuit substrate holding device; a head body that is provided so as to be movable relative to the circuit substrate holding device and forms a mounting head together with the bulk feeder and the mounting device; a head moving device that moves the mounting head relative to the circuit substrate holding device by moving the head body; characterized by one actuator; and a mechanical synchronization device that mechanically synchronizes the lowering of the suction nozzle with at least one of (a) at least a part of operations for supplying the components by the bulk feeder and (b) the start of supplying of component suction-negative pressure, which is performed by the suction-negative pressure control valve, by mechanically transmitting the motion of the actuator to the nozzle lifting and lowering device, and at least one of the bulk feeder and the suction-negative pressure control valve, wherein the mechanical synchronization device mechanically transmits the motion of the actuator to at least one of (i) a shutter, which is movable to a closing position where the component supply section is closed and an opening position where the component supply section is opened, and (ii) a component feeding-pressure control valve, which controls component feeding-gas pressure to be supplied to the guide passage, of the bulk feeder, thereby mechanically synchronizing a lowering motion of the suction nozzle with at least one of the movement of the shutter to the opening position and the blocking of the component feeding-gas pressure that is performed by the component feeding-pressure control valve. a circuit substrate holding device that detachably holds a circuit substrate; a bulk feeder that includes (a) a component storage portion storing electronic circuit components in bulk and (b) a component feed portion aligning the electronic circuit components, which are stored in the component storage portion, in a guide passage in a line and feeding the electronic circuit components to a component supply section; a mounting device that includes (a) a suction nozzle sucking and holding the electronic circuit component by negative pressure, (b) a suction-negative pressure control valve controlling the supply of component suction-negative pressure to the suction nozzle, and (c) a nozzle lifting and lowering device (128, 130) lifting and lowering the suction nozzle, and takes the electronic circuit components out of the component supply section of the bulk feeder one by one by the suction nozzle and mounts the electronic circuit component on the circuit substrate held by the circuit substrate holding device; a head body that is provided so as to be movable relative to the circuit substrate holding device and forms a mounting head together with the bulk feeder and the mounting device; a head moving device that moves the mounting head relative to the circuit substrate holding device by moving the head body; characterized by one actuator; and a mechanical synchronization device that mechanically synchronizes the lowering of the suction nozzle with at least one of (a) at least a part of operations for supplying the components by the bulk feeder and (b) the start of supplying of component suction-negative pressure, which is performed by the suction-negative pressure control valve, by mechanically transmitting the motion of the actuator to the nozzle lifting and lowering device, and at least one of the bulk feeder and the suction-negative pressure control valve, wherein the mechanical synchronization device mechanically transmits the motion of the actuator to at least one of (i) a shutter, which is movable to a closing position where the component supply section is closed and an opening position where the component supply section is opened, and (ii) a component feeding-pressure control valve, which controls component feeding-gas pressure to be supplied to the guide passage, of the bulk feeder, thereby mechanically synchronizing a lowering motion of the suction nozzle with at least one of the movement of the shutter to the opening position and the blocking of the component feeding-gas pressure that is performed by the component feeding-pressure control valve.