Medium supporting mechanism and printing apparatus

A printing apparatus comprising:

• a printing unit configured to perform printing on a medium;
• and
• a medium supporting mechanism configured to support the medium, wherein
• the medium supporting mechanism includes
• a medium supporting unit and
• a medium holding unit,
• the medium supporting unit includes
• a support face supporting a medium,
• a guide rail being provided to extend along a width direction intersecting a transport direction in which the medium is transported, and
• an engaged portion being positioned upstream of the guide rail in the transport direction and intersecting the support face,
• the medium holding unit includes
• a holding portion covering an edge of the medium in the width direction,
• an abutting portion movable between an abutting position and a separation position, the abutting position being a position at which the abutting portion presses and abuts against the abutting surface being an inner wall of the guide rail, the separation position being a position at which the abutting portion is separated away from the abutting surface,
• a switching portion configured to switch a position of the abutting portion from one of the abutting position and the separation position to the other one thereof, and
• an engaging portion configured to engage with the engaged portion, and
• the medium holding unit includes a pressing portion downstream of the abutting portion in the transport direction, the pressing portion being configured to press the support face to move a position of the holding portion in a direction away from the support face.