A mount includes: A. a mount body including a holding unit that detachably holds a target generation device configured to output a target substance for extreme ultraviolet light generation as a droplet into a chamber; and B. a target position adjustment unit that is provided to the holding unit and configured to adjust a position of the target generation device relative to the chamber; and C. a movement mechanism that moves the mount body at least in a horizontal direction. The target position adjustment unit is a stage configured to move the target generation device in two directions orthogonal to a droplet emission axis.