A head position adjustment mechanism including: a head fixing section for fixedly supporting a head section; a linear-motion mechanism to which the head fixing section has been attached; and a bracket to which the linear-motion mechanism has been attached, the bracket has a tapered pin attached to the bracket and a plunger attached to the bracket, the tapered pin and the plunger facing each other, the tapered pin has its tapered part brought into contact with a first side end of the head fixing section in the X-axis direction, the plunger biases a second side end of the head fixing section in the X-axis direction toward the tapered pin, and moving up and down the tapered pin causes the head fixing section to linearly move in the X-axis direction so that the position of the head fixing section is adjusted.