A reflection type optical circulator is provided with improved characteristics in prevention of both PDL occurrence and insertion loss dispersion per each of outgoing and returning optical paths. The optical circulator is comprised of an optical element unit including a first polarized light separation element, a 45 DEG non-reciprocal polarizing optical-plane rotation element, a phase element for rotating incident light polarizing plane by 90 DEG , and a second polarized light separation element; a light input and projection unit; a lens; and a reflective member, wherein all waveguides are disposed at equal intervals from a central point and an abnormal light ray shift quantity of the second polarizing separation element is set to be larger than one of the first polarized separation element. Further, the phase element is comprised of two phase-optical elements, wherein only one of polarized light components is made to pass through the two phase optical elements. The size of the second polarized light separation element is set for the light to pass through only one of the outgoing and returning optical paths. The reflective member reflects two polarized light components which are symmetrical with respect to a point, so that light comes in the second polarized light separation element prior to reflecting forwarding light.