A component position measurement method, comprising: gripping a component using a chuck ; registering a gripping position of the component that is gripped by the chuck as a measurement reference position (A); shifting the component that is gripped by the chuck with an inclination with respect to the measurement reference position (A) so as to block a light beam in a direction intersecting the component at a blocking position (B) by the component ; measuring a positional deviation of the component in a direction that is inclined with respect to the measurement reference position (A) at the blocking position (B) by a measurement unit; obtaining a deviation amount (H) with respect to the measurement reference position (A) by comparing the measurement value with the registered measurement reference position (A); obtaining a measurement correction value (h) with respect to the blocking position (B) of a leading end position (C) of the component based on a similarity relationship between a virtual triangle (a) obtained by setting the deviation amount (H) as one side and the measurement reference position (A) as one point and a virtual triangle (b) passing through the blocking position (B), a leading end of the component , and a position dropping from the leading end of the component to a horizontal line passing through the blocking position (B), with the component length from the measurement reference position (A) to the leading end position (C) measured in advance; and obtaining a component leading end position deviation amount (ΔZ) by summing the deviation amount (H) and the measurement correction value (h). gripping a component using a chuck ; registering a gripping position of the component that is gripped by the chuck as a measurement reference position (A); shifting the component that is gripped by the chuck with an inclination with respect to the measurement reference position (A) so as to block a light beam in a direction intersecting the component at a blocking position (B) by the component ; measuring a positional deviation of the component in a direction that is inclined with respect to the measurement reference position (A) at the blocking position (B) by a measurement unit; obtaining a deviation amount (H) with respect to the measurement reference position (A) by comparing the measurement value with the registered measurement reference position (A); obtaining a measurement correction value (h) with respect to the blocking position (B) of a leading end position (C) of the component based on a similarity relationship between a virtual triangle (a) obtained by setting the deviation amount (H) as one side and the measurement reference position (A) as one point and a virtual triangle (b) passing through the blocking position (B), a leading end of the component , and a position dropping from the leading end of the component to a horizontal line passing through the blocking position (B), with the component length from the measurement reference position (A) to the leading end position (C) measured in advance; and obtaining a component leading end position deviation amount (ΔZ) by summing the deviation amount (H) and the measurement correction value (h). <EOS>