A fly killing device with a flat disk shaped member, an outer rigid tube, an inner rigid tube, an elastic cord and a pull knob. The inner rigid tube is slidably and telecopically engaged within the outer rigid tube. The elastic cord is slidably and telescopicically engaged within the rigid inner tube member. The elastic cord is attached at one end to the flat disk shaped member and at the opposite end to the pull knob. When a user pulls back on the pull knob, the elastic cord is stretched and, when the pull knob is released by the user, the elastic cord retracts rapidly causing the inner rigid tube and the disk member to shoot forward rapidly for the purpose of killing a small insect such as a fly or mosquito.