A pyroelectric senior using P(VDF/TrFE) film for sensing materials has been fabricated and evaluated with other commercial pyroelectric sensors that use ceramic materials for sensing. The device was mounted in a TO-5 housing to detect infrared light of $5.5{sim}14;{mu}m$ wavelength. The NEP (noise equivalent power) and specific detectivity $D^*$ of the device were $2.13{ imes}10^{-8};W$ and $9.37{ imes}10^6;cm/w$ respectively under emission energy of $13;{mu}W/cm^2$ respectively. These result shows a better characteristics than other commercial pyroelectric sensors NEP $8.08{ imes}10^{-7};W$ and $D^*$ $2.47{ imes}10^5;cm/w$.