Medium support device and recording apparatus

A medium support device configured to switch between an extended state where a support surface of the medium support device which supports a medium is extended from a main body and a retracted state where the support surface of the medium support device is retracted into the main body, the main body having a processor that processes the medium, the medium support device comprising:

• a first support section configured to transit between a first position and a second position relative to the main body;
• a second support section configured to transit between a position in which the second support section is retracted into the first support section and a position in which the second support section protrudes from the first support section, the second support section being supported by the first support section;
• and
• a locking mechanism configured to set a lock to the second support section, wherein
• when the first support section is in the first position and the second support section is retracted into the first support section, the retracted state is formed,
• when the first support section is in the second position and the second support section protrudes from the first support section, the extended state is formed,
• the locking mechanism sets the lock to the second support section retracted into the first support section when the first support section is in the first position and, in turn, releases the lock when the first support section is in the second position.