Printer

A printer, comprising:

• a head holder configured to support a thermal head configured to perform printing on a printing medium;
• a platen holder configured to support a platen roller such that the platen roller is rotatable about a support shaft extending in a first direction orthogonal to a conveying direction in which the printing medium is conveyed during printing, the platen roller being configured to press the printing medium toward the thermal head, the platen holder being movable in a second direction orthogonal to the first direction and intersecting the conveying direction;
• an engagement member movably supported by one of the platen holder and the platen roller and engageable with and removable from the head holder;
• and
• a moving mechanism configured to move the platen holder and the engagement member and configured to move the engagement member from a disengaged position at which the engagement member is separated from and not engaged with the head holder, to an engaged position at which the engagement member is located at and engaged with the head holder, in conjunction with moving the platen holder in the second direction from a separated position at which the platen roller is separated from the head holder, to a pressing position at which the platen roller presses the printing medium against the thermal head.