A component mounting positional deviation amount measurement unit comprising: a measurement component placement section (58a, 58b) in which a measurement component is placed; and a measurement mounting table on which a measurement fiducial mark is provided, characterized in that the component mounting positional deviation amount measurement unit further comprises: a measurement nozzle placement section (56a to 56c) in which a measurement nozzle (55a to 55c) is placed, wherein the measurement nozzle is configured to pick up the measurement component and to be exchangeably held in a mounting head of a component mounting machine; wherein when a component mounting positional deviation amount of the component mounting machine is measured, the component mounting positional deviation amount measurement unit is configured to enable picking up the measurement component by the measurement nozzle (55a o 55c) by holding the measurement nozzle (55a o 55c) in the mounting head, mounting the measurement component on the measurement mounting table, and measuring a deviation amount of a mounting position of the measurement component with respect to the measurement fiducial mark as a component mounting positional deviation amount of the component mounting machine, and wherein the component mounting positional deviation amount measurement unit is configured to be set in a feeder setting section of the component mounting machine so as to be exchangeable with a feeder. a measurement component placement section (58a, 58b) in which a measurement component is placed; and a measurement mounting table on which a measurement fiducial mark is provided, characterized in that the component mounting positional deviation amount measurement unit further comprises: a measurement nozzle placement section (56a to 56c) in which a measurement nozzle (55a to 55c) is placed, wherein the measurement nozzle is configured to pick up the measurement component and to be exchangeably held in a mounting head of a component mounting machine; wherein when a component mounting positional deviation amount of the component mounting machine is measured, the component mounting positional deviation amount measurement unit is configured to enable picking up the measurement component by the measurement nozzle (55a o 55c) by holding the measurement nozzle (55a o 55c) in the mounting head, mounting the measurement component on the measurement mounting table, and measuring a deviation amount of a mounting position of the measurement component with respect to the measurement fiducial mark as a component mounting positional deviation amount of the component mounting machine, and wherein the component mounting positional deviation amount measurement unit is configured to be set in a feeder setting section of the component mounting machine so as to be exchangeable with a feeder. a measurement nozzle placement section (56a to 56c) in which a measurement nozzle (55a to 55c) is placed, wherein the measurement nozzle is configured to pick up the measurement component and to be exchangeably held in a mounting head of a component mounting machine; wherein when a component mounting positional deviation amount of the component mounting machine is measured, the component mounting positional deviation amount measurement unit is configured to enable picking up the measurement component by the measurement nozzle (55a o 55c) by holding the measurement nozzle (55a o 55c) in the mounting head, mounting the measurement component on the measurement mounting table, and measuring a deviation amount of a mounting position of the measurement component with respect to the measurement fiducial mark as a component mounting positional deviation amount of the component mounting machine, and wherein the component mounting positional deviation amount measurement unit is configured to be set in a feeder setting section of the component mounting machine so as to be exchangeable with a feeder.