Provided is a mixer faucet configured such that a lubricant can be effectively supplied. The mixer faucet includes a fixed valve body and a movable valve body. The fixed valve body includes a hot water supply hole, a cold water supply hole, a drain hole, a first sliding surface, and a lubricant retention portion. At least a part of the lubricant retention portion is provided in a circumferentially extended region of the hot water supply hole and a circumferentially extended region of the cold water supply hole. In the circumferentially extended region, only the first sliding surface is present between the hot water supply hole and the lubricant retention portion. In the circumferentially extended region, only the first sliding surface is present between the cold water supply hole and the lubricant retention portion.