To provide the fitting structure of a dustproof net, reducing working man-hours for attachment/detachment of the dustproof net, not requiring a specific tool when performing attachment/detachment, and having no possibility of loss of components, by forming the fitting structure of the dustproof net attached to the heat exchanger of a construction machine in such a manner as to be easily attached/detached.

In this fitting structure, the dustproof net composed of a net member filtering cooling air and a frame body surrounding the outer edge of the net member is fitted to the windward side of a frame composed of a pair of sidewall members covering both sides of a plurality of heat exchangers arranged in series or in parallel to a cooling air flowing direction and an arcuate members built on the upper sides of the pair of sidewall members. The fitting structure includes: a clip formed by bending an elastic plate member into a substantially U-shape, and partially having a sandwiching portion with an interval between a base end and an end being narrower than the thickness of the arcuate member, the base end being fixed to the upper end of the frame body; and a fitting hole opened in the arcuate member. The end of the clip is inserted into the fitting hole, and the arcuate member is sandwiched by the sandwiching portion.

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