Insertion type drug injection device

An insertion type drug injection device insertable into a body for injecting a drug into a skin, the device comprising:

• a main body having an open insert part at a head thereof and formed in a tubular shape having a hollow space therein;
• a needle assembly formed in the insert part, provided with a plurality of needles, and including a pneumatic port and a drug injection port, the needle assembly including:
• a holder unit formed in the insert part, and including a plurality of needle holders including needle holes for the plurality of needles to be penetrated therethrough, and the pneumatic port having a suction hole;
• and
• an injection member coupled to the holder unit, and including the plurality of needles formed thereon, and a flow path for injecting the drug into the plurality of needles;
• a drug injection pipe inserted into the main body and connected to the drug injection port of the needle assembly;
• and
• an air flowing pipe connected to the pneumatic port of the needle assembly to generate a suction pressure,
• wherein the holder unit includes a holder unit body with a lower space,
• wherein each needle of the plurality of needles is entirely positioned inward of the insert part of the main body, and
• wherein suction pressure is configured to be generated through the air flowing pipe such that the skin is sucked into the lower space of the holder unit body and such that the plurality of needles is inserted into the skin to thereby inject the drug into the skin.