An object of the invention is to provide a composition for improving memory learning function and/or cognitive function or suppressing deterioration thereof which can be orally taken daily and continuously. As a result of intensive studies, the present inventors have found that the object can be achieved with a composition for improving memory learning function and/or cognitive function or suppressing deterioration thereof containing at least one kind selected from the group consisting of spirulina, phycocyanin, enzymatically degraded spirulina and enzymatically degraded phycocyanin as an active ingredient.