To provide a geological sampler preventing the intrusion of cuttings into a sample.

A core bit 3 constituting the geological sampler has a cutting edge 13 formed with a cylindrical inner excavating face, outer excavating face and an annular tip excavating face inclining inwardly to make the respective tips of the inner excavating face and outer excavating face continuous. The cutting edge has at least two tip groups of a plurality of preceding tips 17 forming the inner excavating face and preceding tip excavating face, and a plurality of succeeding tips 18 forming the outer excavating face and succeeding tip excavating face behind the preceding tips 17.