A mesogenic long-chain tetraphenylporphyrin and its metal complexes(Ni(II), V = O(IV) and Si(OH)(2)) were studied on the mesomorphism and photoconductivity in a symmetrical sandwich-type ITO cell. These complexes show so-called "lamellar-type" mesophases having a layered structure like smectic mesophase. The photocurrent behaviour of these compounds were compared to clarify the characteristic properties of photoconductivity for lamellar mesophases.