Fuel tanks are disposed in parallel along a vehicle transverse direction on a rear sub frame. A noise removal unit removes noise in the polarized images using a noise removing parameter. At least one annular seal prevents ingress of contaminant to the bearing region. The first and second resonant cavities are separated by a sub-wavelength grating layer configured with a non-periodic sub-wavelength grating. The communication routes prepared by a communication route preparation part are notified from a communication route notification part through the relay apparatus to the measurement apparatuses. A counter can also be used as the timer.