The study on the photomechanical effects taken in polymer containing photochromic moieties is currently in progress, in which the incident light energy (photons) is converted into the mechanical work by photoisomerization of azobenzen and diarylethene group. Recently, it was reverted that the photochromic poly(L-glutamate) with the spiropyran (SP) units in the side chain (-[NHCH(CH2CH2COO-SP)CO]n-: PSPLG) exhibits the helix-coil transition triggered by the photoisomerization of SP units with irradiating ultraviolet (UV) light in the various solvents. Generally, it is reported that the poly(L-glutamate) shows the volume change relevant to the helix-coil transition, which is the first order transition. In this study, we designed the photochromic liquid crystalline PSPLG gel having high speed responsive to UV light irradiation.