Fuel injection device

A fuel injection device, comprising:

• a valve body having a free end exposed to a combustion chamber defined in an engine main body and a base end located outside of the engine main body;
• a sensor supported at the free end of the valve body to detect a state of the combustion chamber;
• a sensor signal transmitting member extending from the sensor to the base end of the valve body along an exterior of the valve body to transmit a signal from the sensor;
• a covering member covering the sensor signal transmitting member and securing the sensor signal transmitting member onto an exterior of the valve body;
• a first resin portion molded to the base end of the valve body and provided with a connector portion internally provided with a first connecting terminal;
• and
• a connecting member extending from the first resin portion and connected to the sensor signal transmitting member;
• wherein the covering member includes a second resin portion molded to the valve body and the first resin portion, and covering the sensor signal transmitting member and a part of the connecting member projecting from the first resin portion.