1. An image carrier comprising: a conductive base material; and a photosensitive layer formed on the base material, the photosensitive layer having an outermost surface layer that contains particles having a number-averaged particle sphericality represented by Formula (1) of approximately 0.7 or less: sphericality=4πA/L 2 (1), where π represents the circular constant, A represents a projection area of the particle, and L represents a peripheral length of a projected particle image.