An electronic component mounting device, comprising: a board conveyance device which is configured to convey and position a board on which an electronic component is mounted; wherein the mounting device is configured to position and mount the electronic component to a mounting position of the board; wherein the loading device is configured to pick up multiple engaged members, which are clips, and to position and load the engaged members to a loading position of the board; and wherein the placing device is configured to pick up a cover component that covers the mounted electronic component and that is provided with an engaging portion at a predetermined position, and to position and place the cover component to a position such that the engaging portion corresponds to the engaged member a vertical motion device which includes a pressing portion that is configured to press the cover component; a control device which is configured to drive the vertical motion device, and to press the cover component by the pressing portion multiple times; a measurement device which is configured to measure the height of the board; characterised by: a height storage device which is configured to store measurement results of the heights of multiple predetermined positions of the cover component and measurement results of the heights of multiple predetermined positions of the board measured by the measurement device; and a determination device which is configured to determine whether the pressing has been performed acceptably based on the measurement results. a board conveyance device which is configured to convey and position a board on which an electronic component is mounted; wherein the mounting device is configured to position and mount the electronic component to a mounting position of the board; wherein the loading device is configured to pick up multiple engaged members, which are clips, and to position and load the engaged members to a loading position of the board; and wherein the placing device is configured to pick up a cover component that covers the mounted electronic component and that is provided with an engaging portion at a predetermined position, and to position and place the cover component to a position such that the engaging portion corresponds to the engaged member a vertical motion device which includes a pressing portion that is configured to press the cover component; a control device which is configured to drive the vertical motion device, and to press the cover component by the pressing portion multiple times; a measurement device which is configured to measure the height of the board; characterised by: a height storage device which is configured to store measurement results of the heights of multiple predetermined positions of the cover component and measurement results of the heights of multiple predetermined positions of the board measured by the measurement device; and a determination device which is configured to determine whether the pressing has been performed acceptably based on the measurement results. a height storage device which is configured to store measurement results of the heights of multiple predetermined positions of the cover component and measurement results of the heights of multiple predetermined positions of the board measured by the measurement device; and a determination device which is configured to determine whether the pressing has been performed acceptably based on the measurement results.