A box packing apparatus supports a box with a sideways facing opening while at a loading location. After loading the box is moved from the loading location. The box packing apparatus includes a supporting and moving component, arms, and a feed mechanism. The supporting and moving component supports the cardboard box in the loading location and moves the cardboard box after loading in the loading location. The arms temporarily support the cardboard box as it is delivered to the loading location with the opening thereof facing sideways, while the supporting and moving component moves the cardboard box. The feed mechanism feeds the articles into the cardboard box through the opening while the box is supported by the arms.