To provide a fat accumulation inhibitor and a food or drink for inhibiting fat accumulation, a visceral fat accumulation inhibitor and a food or drink for inhibiting visceral fat accumulation, or an agent for accelerating increase and/or inhibiting decrease of an adiponectin concentration in blood and a food or drink for accelerating increase and/or inhibiting decrease of an adiponectin concentration in blood. A fat accumulation inhibitor for a fat cell, which comprises a milk-derived phospholipid as an active ingredient, and a food or drink for inhibiting fat accumulation in a fat cell, which comprises a milk-derived phospholipid. A visceral fat accumulation inhibitor comprising a sphingosine-containing phospholipid or a derivative thereof as an active ingredient, and a food or drink for inhibiting visceral fat accumulation. An agent for accelerating increase and/or inhibiting decrease of an adiponectin concentration in blood, which comprises a sphingosine-containing phospholipid or a derivative thereof as an active ingredient, and a food or drink for accelerating increase and/or inhibiting decrease of an adiponectin concentration in blood.