Vertically sliding manual opening and closing door

A vertically sliding manual opening and closing door comprising:

• a door member configured to open and close an opening section by being slid vertically;
• a support member configured to guide the vertical sliding of the door member by a support section configured to support left and right end sections of the door member;
• and
• a lock mechanism configured to position the door member that has been raised, wherein
• the lock mechanism includes a lock member attached to an external side surface of the door member and biased to an external side of the lock mechanism by a biasing force of a biasing member, and includes an engaging member that is pushed in an outside direction with respect to the support member by the biasing force of the biasing member formed on the lock member,
• the support member includes a cutout portion corresponding to a size of the engaging member, the engaging member configured to pass through the cutout portion when engaged with the cutout portion,
• the support member includes a receiving member that receives the engaging member of the lock member from the cutout portion, the receiving member extending outward from a face of the support member, and
• the receiving member includes a cover plate that covers the cutout portion.