An intravenous catheter introducing device includes a needle hub slidably inserted into a barrel and holding a needle cannula, a biasing member disposed to bias the needle hub to a rear position so as to retract the needle cannula in the barrel, and an easy release unit including an engaging wall segment which is attached to an outer surface of the barrel, two flexible squeezed wall segments which extend from the engaging wall segment and which is squeezable so as to move two latch members to steer clear of a retained end of the needle hub through an access hole in the barrel, thereby permitting the biasing member to bias the needle hub towards the rear position.