To provide a washer tank having a simple structure capable of appropriately grasping the remaining quantity of washer liquid in a washer tank and capable of facilitating arrangement for effectively utilizing a space in a vehicle.

The washer tank 1 includes a tank body 10 and a filing pipe 20. A storing chamber 11 for storing the washer liquid is formed in the tank body 10. The filing pipe 20 includes a communicating part 24 for communicating with a lower part of the storing chamber 11, a filing port 21 opening upward and a guiding passage 23. The guiding passage 23 extending from the communicating part 24 to the filling port 21 in a substantially linear shape guides the washer liquid filled from the filing port 21 to the storing chamber 11 via the communicating part 24. As the liquid level of the washer liquid in the storing chamber 11 and the liquid level of the washer liquid in the guiding passage 23 is at the same height, the remaining quantity of the washer liquid in the storing chamber 11 is checked by looking in the guiding passage 23 from the filling port 21 and visually recognizing the height of the liquid level of the washer liquid.