Abstract: The invention discloses a shaft structure comprising a fixing part and a braking part, and both the fixing part and the braking part are disposed in a housing. The fixing part comprises a plurality of first protruding part and a plurality of concave part formed between any two adjacent first protruding parts. The braking part comprises a plurality of flexible second protruding part, and each second protruding part leans against to one of the concave parts. The braking part can be fixed in a specific angle relative to the fixing part after the braking part rotating along with the fixing part by crossing each of the second protruding part over the first protruding part and leaning against the adjacent concave part.