Provided is an injection device for reliably injecting a medicine into the skin by suppressing leakage of a medicine to the skin surface. An injection tool according to one embodiment of the present invention includes one or more protrusions (12) on a first surface (11 S) of a substrate (11), and a through hole is formed in each protrusion (12) A deformable portion (25) arranged on the outer peripheral side of one or more protruding portions (12) and deformable in a direction projecting from the first surface (11 S) a hollow needle-, And a pressurizing flow path (26) for applying a fluid pressure to the deforming portion (25), wherein the deforming portion (25) is formed so as to protrude from the first surface (11 S) to the projection Deform in the direction.薬剤の皮膚表面への漏れを抑制して皮内に確実に薬剤を投与するための注入器具を提供する。本発明の一態様に係る注入器具は、基板(11)の第1の面(11S)に1又は2以上の突起部(12)を有し、各突起部(12)には貫通孔が形成される中空型針状体(10)と、1又は2以上の突起部(12)の外周側に配置されて、第1の面(11S)から張り出す方向に変形可能な変形部(25)と、変形部(25)に流体圧力を付加する加圧用流路(26)と、を備え、変形部(25)は、流体圧力に応じて第1の面(11S)から突起部12の突起方向へ変形する。
