HEAD POSITION ADJUSTMENT MECHANISM AND LINE HEAD

To provide a head position adjustment mechanism that makes it possible to easily adjust the position of a head section in a longitudinal direction (X-axis direction) with a high degree of accuracy. [Solution] The present invention is directed to a head position adjustment mechanism 100 including: a head fixing section 3 for fixedly supporting a head section 1; a linear-motion mechanism 5 to which the head fixing section 3 has been attached; and a bracket 2 to which the linear-motion mechanism 5 has been attached, wherein the linear-motion mechanism 5 serves to guide the head fixing section 3 in an X-axis direction with respect to the bracket 2, the bracket 2 has a tapered pin 22 attached to the bracket 2 and a plunger 23 attached to the bracket 2, the tapered pin 22 having a tapered part 22d at a lower end of the tapered pin 22, the plunger 23 having a unidirectional biasing function, the tapered pin 22 and the plunger 23 facing each other, the tapered pin 22 has its tapered part 22d brought into contact with a first side end of the head fixing section 3 in the X-axis direction, the plunger 23 biases a second side end of the head fixing section 3 in the X-axis direction toward the tapered pin 22, and moving up and down the tapered pin 22 causes the head fixing section 3 to linearly move in the X-axis direction so that the position of the head fixing section 3 is adjusted.