A simple laser interferometer is proposed. It consists of a small concave mirror, a gas laser, a semitransparent flat mirror, a concave ellipsoidal mirror under test, and a register equipment. Laser beam is reflected by very small concave or convex paraboloidal mirror and then it is directed to the semitransparent flat mirror, and to the mirror under test. The light reflected by the flat mirror is the reference wave, the light reflected by the mirror under test is imperfect wave to be tested. The reference wave and the imperfect wave are recombined to produce a system of fringes in a receiving screen or in a register equipment to obtain useful interferograms. It is possible to test any concave ellipsoidal mirror by properly shifting of the semitransparent flat mirror along the optical axis. The interferometer was successfully manufactured and tested at Crimean Astrophysical Observatory.
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