Free-standing infrared detector with an Al/P(VDF-TrFE)/NiCr structure was fabricated. A semitransparent NiCr metal thin film on top of the device served as both electrode and absorption layer. The experimental results reveal that P(VDF-TrFE) has good ferroelectric and pyroelectric properties with remanent polarization 7.1 μC/cm² and pyroelectric coefficient 27 μC/m²K respectively. The voltage responsivity R_V and detectivity D* of the device at 10 Hz with blackbody source temperature at 500 K are around 1 500 V/W and 5×10⁷ cmHz^1/2W^-1, respectively. The thermal conductance of unit area to the environment and absorption of the detector were estimated to be 2.5×10^-3 W/cm²K and 0.1, respectively, from the frequency dependence of the voltage responsivity. Using the detector, the thermal image of target was obtained.