To provide a rotary engine, capable of using various types of fuel, such as gasoline, diesel oil, and heavy oil, improving combustion efficiency, expediting clean emission, conducting compression/explosion/exhaust/intake during one rotation of one rotor, and efficiently conducting compression/explosion at a plurality of positions of a casing.

This rotary engine includes four rotors respectively having at least five blade sections which form an involute curve in the casing. The four rotors have the identical number of blades sections, and are rotatably supported and placed in the casing, two in the vertical direction and two in the transverse direction so that the blade sections are engaged with each other, thus compressing vaporized fuel between the blade sections and a rotor base section according to rotation of each blade section of the four rotors for explosion.

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