PROBLEM TO BE SOLVED: To provide a microneedle capable of allowing a discharged chemical to reliably remain in skin when injecting the chemical after puncturing.SOLUTION: Each hollow needle 7 of a hollow needle shape body 1 is configured to have an average hollow cross-sectional diameter of 40-70 &mu；m, have a hydrophilic treatment layer 5 on a hollow inner wall, and have a hydrophobic treatment layer 6 on a hollow outer wall. The hollow inner wall of the hollow needle 7 is configured by setting a contact angle of pure water to be 0-20° or 80-120°. Furthermore, the hollow needle 7 is configured to have an average hollow cross-sectional diameter of 5-30 &mu；m, and have a hydrophilic treatment layer on the hollow inner wall.
