To enable the adjustment of a visual field which is suitable for individual drivers by constituting a reflection member loaded on pivotal movement connection means in such a manner that it performs an angular movement with respect to a pivotal movement axis orthogonal to a plane including two specific lines.

A reflection member such as a mirror glass 12 is fixed to a carrier. Points 78 and 80 in an end part of a principal axis of a vertical cross section 76 which passes through an eyellipse of 95% are a position of the eye of drivers in a first group which positions a seat at the most back of all the drivers who are within 95% and a position of the eye of drivers in a second group which positions a seat in the most front of all the drivers who are within 95%, respectively. A rotary axis of the mirror glass 12 is oriented for a vertical axis Z in such a manner that it crosses a plane including a line 52-82 which bisects an angle between an incident light line 54-52 and the corresponding reflection light line 52-78 and a line 52-84 which bisects an angle between the incident light line 54-52 and the corresponding reflection light line 52-80 orthogonally.