PROBLEM TO BE SOLVED: To provide an injection needle device excellent in less-invasiveness and efficiency.SOLUTION: An injection needle device includes at least one injection needle that comprises a closed tip part and a body part including a lumen and a lateral opening communicating with the lumen, and a support block for supporting the at least one injection needle. The support block comprises an inclined plane that is inclined with respect to a side surface of the body part of the at least one injection needle. The at least one injection needle is extended in such a manner as to protrude from the inclined plane.
