There is provided a set of tank and bottle. A tank includes a liquid chamber, an inclined wall and an inlet. A bottle includes a bottle body having a first opening, and a nozzle. The nozzle has: a trunk section fitted onto the end portion of the bottle body; a shoulder section brought into contact with the end portion of the bottle body; and a nozzle section having a second opening formed in a protruded end portion thereof. In a pouring posture of the bottle in which the nozzle section inserted into the inlet is positioned at a periphery of the inlet, an angle defined between a normal line of the inclined wall and an inner surface of the nozzle section is smaller than an angle defined between the normal line and a horizontal line.