Importance

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Abstract

A ventilation device that discharges water vapor within a housing of a vehicular lamp to the outside, and includes: an attachment part attached in communication with ventilation opening in the housing; and a ventilation path that is a hollow formed from upstream toward downstream side, and that has a bent part which bends from a first to a second direction. In ventilation path: cross-sectional area S3 of a cross section orthogonal to second direction on downstream side is constituted by making cross-sectional area S2 of a cross section orthogonal to the first direction on the entrance side of bent part larger than the cross-sectional area S1 of a cross section orthogonal to first direction on upstream side, and making the length, in first direction, on exit side of bent part shorter than the length, in second direction, of the cross-sectional area S1; thereby, cross-sectional area S1≦ cross-sectional area S3.

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First Claim