PROBLEM TO BE SOLVED: To accurately implant a dental implant at a position designed during diagnosing.SOLUTION: The dental implant 51 includes a male screw part 2 and an insertion torque increase part 3 from a distal end side. The male screw part includes a plurality of screw parts 4 and 5 of the same lead and different pitches. The plurality of screw parts are arranged in the size order of the pitch so that the pitch becomes larger on the distal end side. The outer diameter of the male screw part is fixed in the direction of a center axis 11 or is larger on the insertion torque increase part side. The insertion torque increase part includes a thread having the lead different from the lead of the male screw part or a projected line continuing in a circumferential direction. On the cross section of the insertion torque increase part including the center axis, a contour line connecting, in an order along a center axis direction, top parts of the thread of the screw part adjacent to the insertion torque increase part among the plurality of screw parts is a straight line, and the top part of the thread or the top part of the projected line of the insertion torque increase part is positioned on an extension of the contour line.COPYRIGHT: (C)2013,JPO&INPIT
