To provide a microinjection apparatus in which introducing of an introducing substance to transductants, such as a cell can be carried out certainly and efficiently by two or more injection needles, and improvement in treatment efficiency is possible, and which can eliminate displacement in a tip of an injection needle affected by assembly accuracy.

A conveyer 4 for moving an injection needle 11 has two freedoms which make a first moving body 41 and a second moving body 42 to freely advance and retreat in directions which intersect perpendicularly and mutually at least. A first and a second advance and retreat driving means 45 and 46 which make the first and the second moving bodies 41 and 42 move respectively are installed at a base 40. An output material 46a of the second advance and retreat driving means 46 is made to freely move to a direction which intersects perpendicularly with a direction to freely advance and retreat to the second moving body 42. A cushioning material 48 which consists of an elastic body, and buffers a force of a moving direction of a moving body which is added to the second moving body 42 from the output material 46a is made to intervene between the second moving body 42 and the output material 46a of the second advance and retreat driving means 46.