A liquid supplying system includes a cartridge and a tank connectable to the cartridge. The cartridge includes a first storage chamber and a first air communication port. The tank includes a second storage chamber, an inlet port, an outlet port, a second air communication port, and a semipermeable membrane. Liquid stored in the first storage chamber of the cartridge connected to the tank is introduced into the second storage chamber through the inlet port and discharged through the outlet port. The semipermeable membrane is provided to cover the second air communication port and allows air to pass therethrough. The semipermeable membrane is positioned below the inlet port.