Two-dimensional　(2D)　materials　have　been　proposed　as　promising　candidate　for　spintronic　applications　due　to　their　atomic　crystal　structure　and　physical　properties.　Here,　we　introduce　exfoliated　few-layer　tungsten　diselenide　(WSe2)　as　spacer　in　a　Py/WSe2/Py　vertical　spin　valve.　In　this　junction,　the　WSe2　spacer　exhibits　metallic　behavior.　We　observed　negative　magnetoresistance　(MR)　with　a　ratio　of　-1.1%　at　4　K　and　-0.21%　at　300　K.　A　general　phenomenological　analysis　of　the　negative　MR　property　is　discussed.　Our　result　is　anticipated　to　be　beneficial　for　future　spintronic　applications.　(C)　2017　Elsevier　B.V.　All　rights　reserved.