The present invention relates to an all-in-one self-test kit that miniaturizes a device necessary for diagnosing various infectious diseases and integrates several diagnostic tools into one to perform a simple, quick and convenient diagnostic test for infectious diseases. a test device comprising: a diagnostic kit comprising a container, a diagnostic strip having a first body and a second body, the diagnostic strip including an absorbent part into which a diagnostic reagent is absorbed and a diagnostic part reacting with the diagnostic reagent absorbed in the absorbent part; a sub-body including a container insert into which the reagent container is inserted, and a kit insert into which the diagnostic kit is inserted; a main body into which the sub-body is inserted; and a cap fastened to and separated from the inlet of the main body to open and close the main body.
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