The present invention provides a filter installed in an air conditioner pipe, which can be inserted to be installed without expanding an air conditioner pipe by manufacturing the filter having the same or smaller diameter as or than an internal diameter of the air conditioner pipe. To achieve this, according to the present invention, the filter installed in an air conditioner pipe has a passing flow path having the shape of a cylindrical pipe therein, and is manufactured with a porous structure in which a plurality of fine holes are formed to be penetrated along an external surface thereof. A diameter of the filter is manufactured to be the same or smaller diameter as or than an internal diameter of the pipe for the filter to be installed in a state of being inserted into an internal flow path of the pipe.
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