Abstract: An intrauterine device constructed of a flexible plastic and comprising a stem having adjacent one end a plurality of arms or branches extending laterally therefrom and being biased slightly in a direction toward the opposite end; the planes of said arms being at an angle of less than 90.degree. to the plane of the stem and said arms being flexible about their juncture of engagement to said stem for bending toward or opposite the remote end thereof. Said stem remote from said arms is relatively thin and elongated and with there being a hook in its said remote end extremity. A tool for inserting said device is provided having a chamber for accepting the thin elongated portion of said device and finger-like guides embracingly engaging opposite sides of said stem between arms thereof and having its device engaging portion formed on a radius for promoting facile disengagement from the device upon limited longitudinal tilting of the tool when the device is in operative position.