An electronic-circuit-component pick-up instruction data generating device is provided that generates pick-up instruction data for automatically picking up an electronic circuit component from a nonmatrix tray defined to have nonmatrix arrangement in which arrangeable positions of the electronic circuit components are arranged in a nonmatrix pattern, other than a matrix tray defined to have matrix arrangement in which arrangeable positions of a plurality of the electronic circuit components are regularly arranged in a matrix pattern in a state of being positioned at all the intersection points made by two groups of straight lines that are parallel to two directions orthogonal to each other, respectively, and that are separated at regular intervals for each direction. An electronic-circuit-component mounting machine is provided that picks up an electronic circuit component from the nonmatrix tray based on generated pick-up instruction data, and automatically mounts the component on a circuit board.