The present invention discloses a microneedle structure and a biodegradable microneedle thereof. The microneedle structure comprises a substrate and a plurality of biodegradable microneedles on the substrate. Each biodegradable microneedle defines a central axis and includes a maximum inner diameter corresponding to a height and a vertical central axis of the central axis. The height is between 350 microns and 430 microns, and the ratio of the height divided by the maximum inner diameter is between 1.2 and 5.0. Each of the biodegradable microneedles includes a first step connected to the substrate and a second step formed to gradually extend away from the base from the first step. The ratio of the first step portion to the height is 0.9 times to 7.0 times the proportion of the second step portion in the height.本創作公開一種微針結構及其生物可降解微針。所述微針結構包含一基底及位於基底上的多個生物可降解微針。每個生物可降解微針定義有一中心軸線、並包含有對應於中心軸線的一高度及垂直中心軸線的一最大內徑。高度介於350微米～430微米，高度除以最大內徑的一比值是介於1.2～5.0。每個生物可降解微針包含有連接於基底的一第一階部及自第一階部朝遠離基底方向漸縮地延伸形成的一第二階部。所述第一階部於所述高度中所佔的比例為所述第二階部在所述高度中所佔的比例的0.9倍～7.0倍。
