We have fabricated a multi-mode nonlinear plastic optical fiber (POF) using organic nonlinear optical materials and demonstrated the propagation of light. The refractive indices of core and cladding are 1.5240 and 1.5172. We made a POF preform by rod-in tube method. The core diameter of the fabricated POF is about $30{mu}m$. We evaluated the temperature characteristics of POF. The sensitivity is $0.345{;}mW/^{circ}C$ and the linearity of sensor was good.