To provide a side surface guard capable of guarding the side surface of a face and being attached to a cap, and the cap.

This side surface guard 1 for guarding the side surface of a person wearing the cap is provided by including a plate-formed blocking plate 2 partially formed with a linearly penetrating slit 4, and a plate-formed holding plate 3 enabling its insertion into the slit 4 from the one side surface S1 of the blocking plate 2 over to the other surface S2 side, and at the inserted state, having a bent part 6 folded back along the linear direction of the slit 4 and having a spring property, forming a plurality of recessed parts, etc., at the bent part 6 and capable of engaging a lower inner end surface or an upper inner end surface of the slit 4 with the recessed parts, etc.

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