Abstract: This invention relates to a protection device for a syringe needle comprising an elastic needle cap of general longitudinal direction presenting a closed distal end and an open proximal end, said cap being formed by a lateral wall defining an inner housing intended to receive the distal part of the body of a needle syringe, and by an end wall capable of being pierced through a part of its thickness by the free end of said needle. The housing comprises, from said proximal end, an opening, a first portion, a second portion intended to house the distal part of the syringe body which bears said needle, and a third portion which narrows from said second portion in the direction of the back of said housing. The lateral wall is further provided with an annular bead disposed in said housing between said first and second portions of said housing.