To provide a tool for adjusting a syringe needle punctures capable of adjusting puncturing the depth of the syringe needle to the target depth, and a syringe needle assembly with the same, particularly, designed to perform a puncture safely by causing no pain when injecting vaccine hypodermically to infants in the preventive inoculation and other occasions.

The syringe needle assembly 1 has a syringe needle hub 4 and comprises a puncturing adjustment tool 2 for the syringe needle. The puncturing adjustment tool 2 for the syringe needle is a cylindrical body arranged to the syringe needle hub 4, extending coaxially with the syringe needle 3, having the syringe needle 3 in its inside, with one end fixed to the syringe needle hub 4, and the needle tip of the syringe needle 3 projected from the other end.