Measuring apparatus of optical properties and optical system

It is a measuring apparatus of optical properties (100A; 100B; 100C; 100D; 100E; 100F) provided whose size can be reduced and which can achieve an improved versatility. The measuring apparatus of optical properties (100A; 100B; 100C; 100D; 100E; 100F) comprises: a first optical element (12; 13; 14) which converts the measurement light (2) from a measurement target object (SMP) into parallel light (4) ; a reflective lens (20) which the parallel light (4) from the first optical element (12; 13; 14) reflected to convert the parallel light (4) into convergent light (6); a light receiving section (60) which receives the convergent light (6) from the reflective lens (20); and a drive mechanism (54) having a position of the first optical element varies relative to the measurement target object (SMP) (12; 14; 13).