To provide a linear generator suitable for an environment where an installation is made under conditions, such as problems inherent in a shock absorber, and height of an installation place and size of a housing area depending on a vehicle type.

Fins are installed in an air circulation space to the outer periphery of a shock absorber and a linear generator is installed outside thereof. Moreover, the linear generator is installed in parallel to a vibration reducing device of a vehicle of every kind, and electric power is generated by replacing operation of a piston rod of the vibration reducing device with sliding of a power generation unit of the liner generator. Furthermore, an air damping device is installed in the upper part of the linear generator and the linear generator is used as the device also having a seismic control effect.