To provide an airtight switch part made of resin composition with excellent mechanical property, thermal property, and fusing property without damaging thin wall thickness molding property, low warping property, surface smoothness, calcium chloride resistant property, electric property, and abrasion resistant property.

A molding body is formed integrally by integrally fusing a molding 1 formed by insert molding a metal terminal and a molding 2 airtightly protecting the metal terminal part. The moldings 1, 2, (A) melting point is 170 to 260°C and crystallization temperature is 220°C or lower in a state of final resin composition. The switch part is constituted of a resin composition containing a mixture of which the mixing ratio (B)/(C) of fibrous glass fiber with average diameter of 0.1 to 50μm (B), to fibrous glass fiber with average diameter of 0.1 to 1,000μm (C) is 0.1 to 10, by 10 to 200 wt.% against 100 wt.% of a thermoplastic resin of which the relation between the melting point and crystallization temperature fulfills a formula; Tm (melting point)≥Tc (crystallization temperature)+20°C.

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