A needless luer access connector module, including: a flow guiding seat having an ultrasonic welding portion； an elastic valve being sleeved on a flow guiding tube extending upward from the flow guiding seat； and a hollow sleeve having an inner annular surface formed above an inner wall of a sleeve base portion of the hollow sleeve, the inner annular surface extending centripetally toward a central long axial of the hollow sleeve, the inner wall of the hollow sleeve defining a position limiting portion, wherein the hollow sleeve is assembled with the flow guiding set to enclose the elastic valve within the flow guiding seat and the hollow sleeve, allowing the inner annular surface to contact with the ultrasonic welding portion and the position limiting portion to cap a side portion of the flow guiding seat to enable the hollow sleeve to be assembled with the flow guiding seat stably so as to increase the success rate of the ultrasonic welding between the ultrasonic welding portion and the inner annular surface.一種免針連接頭模組，包括：一導流座，導流座的周圍包含有一超音波熔接部；一彈性閥體，其套設於導流座上向上延伸的導流管；以及一套筒，套筒的一套筒基部的內壁的上方形成有一內環底平面，內環底平面相對於套筒基部內縮，套筒基部的內壁定義出一環壁限位部，其中套筒套置於彈性閥體外部並與導流座組接，使內環底平面接觸於超音波熔接部，且環壁限位部貼合於導流座的一座體側部，使套筒能穩固地設置於導流座上，用以提高超音波熔接部與環壁限位部之間超音波熔接的成功率。
