An organic molecular device of an embodiment includes a first and a second conductive layers and an organic molecular layer having an organic molecule provided between the first and the second conductive layer. The organic molecule includes a one-dimensional or quasi one-dimensional π-conjugated system chain having either a first aromatic ring or a second aromatic ring. The first aromatic ring has one or more substituents that are an electron withdrawing group, each substituent of the first aromatic ring is independently selected from the group consisting of the electron withdrawing group and hydrogen, the second aromatic ring has one or more substituents that are an electron releasing group, and each substituent of the second aromatic ring is independently selected from the group consisting of the electron releasing group and hydrogen. The first aromatic ring or the second aromatic ring exist in an unbalanced manner in the π-conjugated system chain.