A sensor chip for use in a sensor for detecting the localized plasmon resonance state of a metal particle surface by light and analyzing properties of a sample present near metal particles. The sensor chip includes a support with a plurality of pits individually and independently formed in one surface thereof so that they extend toward an interior thereof, and metal particle rods respectively held in the plurality of pits so that an end surface of each rod is exposed at the one surface of the support and a longitudinal side surface of each rod is covered with the support.