Fuel injector of internal combustion engine

To provide a fuel injector having a plurality of injection holes (112) injecting fuel into a combustion chamber of a gasoline engine in which each of the plurality of injection holes includes a guide section (114) to determine an injection direction and an injection amount of the fuel passing therethrough and a spreading section (116) to change a state of the fuel passing through the guide section to a spray state, and at least one of the plurality of injection holes is configured such that a central axis (118b) of the spreading section is parallel to a central axis (118a) of the guide section while being formed eccentrically on a side farther from a central axis (120) of the fuel injector than the central axis of the guide section.