A braking force generation device of a vehicle includes a rotary member, a frictional member, a pressing device, and a self-discharge type static charge eliminator provided on a surface of a particular member. The self-discharge type static charge eliminator changes air around the self-discharge type static charge eliminator into negative air ions, according to the quantity of positive charge carried by the particular member, and eliminate charge by causing the negative air ions to attract the positive charges of the particular member for neutralization, so as to reduce a quantity of charge of the particular member, and thereby reduce a quantity of charge of the lubricant.