A sensor device according to the present invention includes: a sensor element including a temperature-sensitive resistor; and a protective cover that protects the sensor element, wherein the sensor element has a shape extending long along one direction, and the protective cover surrounds a periphery of the sensor element with a plurality of support pillars extending obliquely with respect to a longitudinal direction of the sensor element. It is preferable that the plurality of support pillars intersect in a lattice-like manner.