Delivery rack and delivery vehicle

A delivery vehicle comprising a rack, wherein:

• the rack has:
• a casing;
• a plurality of returnable containers;
• M pairs of supports, with M being an integer not less than two, that are provided inside the casing so as to extend in a depth direction and arrayed in M tiers at regular intervals in an up-down direction;
• and
• a lock mechanism that locks the returnable containers housed while being supported so as to be slidable along the respective M pairs of supports;
• the rack is able to house all the returnable containers of one or more prespecified sizes;
• the casing is divided into N rows by (N−1) partition plates, with the M pairs of supports provided in each of the N rows, and the rack is able to house a maximum of (M×N) returnable containers;
• each of the N rows is provided with a door that allows the row to be separately opened and closed;
• the lock mechanism is provided in each of the (N−1) partition plates so as to extend through the partition plate and correspond to each tier;
• and
• the lock mechanism simultaneously locks two returnable containers that are housed adjacent to each other on one side and the other side of the partition plate.