Abstract: Disclosed herein area honeycomb core and a sandwich panel for the same. The honeycomb core includes a group of cells, which are continuously arranged in the direction of a two-dimensional plane such that the honeycomb core has the shape of a wide plate having a predetermined thickness. The honeycomb core further includes a plurality of protrusions. The protrusions are protruded from either the upper end or the lower end of the core member of the honeycomb core so as to form an uneven surface structure, and are perpendicular to the thickness direction of the honeycomb core, and partially come into surface contact with a board, which is bonded to the upper or lower surface of the honeycomb core, so as to enable spot welding or laser welding.