A coil component includes: a pillar part; first and second rectangular planar parts, each having long sides L, short sides S, and thickness T; a coil formed around the pillar part; two terminal electrodes electrically connected to both ends of the coil; and an outer sheath containing magnetic grains and resin material and covering the coil at least partially; wherein the thickness PL in the L direction and thickness PS in the S direction, of the outer sheath, in a section cut across the center of the pillar part and in parallel with the LS planes, satisfy the relationship of PL