An ocarina molded of a plastic is provided to mass-produce products of a uniform tone color by preventing an inaccurate bonding due to minute vibration generated during an ultrasonic bonding. In an ocarina molded of a plastic, a plurality of holes for changing the musical scale are formed in a divided body(1). An interior space(2) is formed in the body. An adhering surface(3) is formed on the outer side of the interior space. A recess(4) having a predetermined depth and a protrusion(5) engaged with the recess are formed on the adhering surface. A molten portion(10) is formed on the outer surface of the protrusion. The recess and the protrusion are formed at a portion closest to a portion at which the interior space is formed. The molten portion formed in the protrusion is formed on the upper surface of the protrusion. A catching recess is formed on the adhering surface of the body so that both ends thereof can be opened.
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