A foldable box includes a floor having a shaft arranged in a base area of an exterior wall area thereof. A guide opening in the fixed exterior wall area and includes a lateral opening section extending from an outside of the fixed exterior wall area inwards. A cam in the base area includes a cam contour which gets into contact with a contact surface of the exterior wall area. When exceeding a boundary angle the shaft is moved inwards. After exceeding the boundary angle a bottom side of the exterior wall is pressed against an internal edge area of the fixed exterior wall area by a force higher than a force by which the bottom side of the exterior wall in the erected vertical position is pressed against a top side of the fixed exterior wall area by the effect of the shaft or the cam.