Printing apparatus and method of fixing support unit

A method of fixing a support unit in a printing apparatus including

• a supporting unit including an insertion part on which an indented part is provided, the supporting unit being configured to support a medium;
• a base unit including an insertion inlet into which the insertion part is insertable, the base unit being configured to have the supporting unit attach and detach to/from the base unit along an attachment/detachment direction;
• and
• a fixing part configured to, when the insertion part is inserted into the insertion inlet up to a fixing position, fix the insertion part to the insertion inlet at the fixing position, wherein
• the fixing part includes a first fixing part provided on one side in an intersecting direction which intersects with the attachment/detachment direction, and a second fixing part provided on the other side in the intersecting direction, the method comprising:
• fixing the supporting unit at the fixing position by, when the insertion part is inserted up to the fixing position, engaging the first fixing part with the indented part when the indented part is located at a position facing the first fixing part, and not engaging the second fixing part with the indented part when the indented part is located at a position facing the second fixing part.