A relationship between an inner diameter A of a sac volume (30) and a distance (B) from a central axis (c) of the sac volume (30) is set to satisfy a condition of 1≤A/2B≤20. In this way, fuel, which flows from the sac volume (30) into each injection hole (31), will be injected from the injection hole (31) without being spaced from a wall surface of a valve body (21), which form the injection hole (31). Thus, it is possible to limit adhesion of a foreign substance to a wall surface of each injection hole (31). Furthermore, even if the foreign substance is adhered to the wall surface of the injection hole (31), the foreign substance can be removed by the fuel, which flows through the injection hole (31).