To provide a strength prospect method for a foundation part, a compression strength prospecting apparatus, a compression strength determining apparatus which may more accurately prospect a compression strength of a foundation part or may more accurately determine whether the foundation part has a required compression strength independently from the volume of excavated soil included in a sample.SOLUTION: There is provided a compression strength prospecting apparatus 40 for prospect of compression strength of solidified foundation part from a soil cement sample recovered from the foundation part before its solidification, comprising: a water volume measurement controlling part 52 and a water volume measurement mechanism 60 for obtaining the weight of water in the sample; a cement volume measurement controlling part 53 and a cement volume measurement mechanism 70 for obtaining the weight of cement in the sample; a compression strength prospecting part 54 prospecting compression strength of solidified sample from correlation between a previously obtained mass ratio of cement and water in the soil cement comprising components of a layer in which the foundation part is formed and compression strength, the weight of water and the weight of cement; and a display part 57 displaying prospected result.SELECTED DRAWING: Figure 3
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