Abstract: A vehicular trunk-through openable and closable device (5) whose unlocked condition can be more easily checked than has conventionally been done. When releasing a locked condition of an opening and closing unit (11) using an unlocking unit (12), the unit (11) is rotated in a forward-folding direction by an elastic force caused by an elastic member (30). A gap is formed between the unit (11) and a trunk-through section (3) without bringing the unit (11) into a fully open condition. Hence, it can be visually checked whether the gap has been formed between the unit (11) and the trunk-through section (3) or not, thus enabling a user to instantly determine whether the locked condition has been released by the unlocking unit (12). Thus, an unlocked condition of the vehicular trunk-through openable and closable device (5) can be much more easily checked than has been conventionally done.