The present invention provides a method for preparing homogeneous stem cells and/or precursor cells in a large amount, in a simple and efficient manner, from human (in particular, the subject per se). The present invention further provides a method for preparing tissue implant or graft in a large amount by the use of the stem cells and/or precursor cells of the present invention. The present inventors have unexpectedly discovered that an aspirate from liposuction contains a large number of stem cells and have established a method for preparing stem cells from such an aspirate from liposuction, and thereby achieved the above-mentioned object.
