A medical safety needle (1) is comprised of a needle body (15) having a needlepoint (P), a covering body (9) having a detent portion (47) slidable on the needle body (15) to catch the needlepoint (P) so as to cover the needlepoint (P), and a resilient cantilever (31) supporting the detent portion (47), a collar portion (13) slidably fitting on the covering body (9), which is configured to get in contact with the cantilever (31) to press the cantilever (31) radially inwardly, and a housing (11) being formed in a unitary body with the collar portion (13) or having an end face on which the collar portion (13) is capable of being seated, the housing being configured to carry the covering body (9) from a first position to have the needlepoint (P) exposed to a second position to have the needlepoint (P) covered by the covering body (9).
