A pressure sensitive sensor provided in at least one of an opening section and an opening and closing section for opening and closing the opening section and serving to detect pinching of an object between the opening section and the opening and closing section based on an output signal generated by deformation upon receipt of external force, comprising pressure sensitive means 33 for generating an output signal corresponding to deformation and support means 35 for supporting the pressure sensitive means 33 on at least one of the opening section and the opening and closing section, the support means 35 including at least a first deformation section 37 having a first elastic modulus and serving to increase deformation of the pressure sensitive sensor 17, and a second deformation section 39 having a second elastic modulus which is higher than the first elastic modulus.