Peptide(s) produced from degraded soybean protein by an alkaline protease from Bacillus circulans HA12 (degraded soybean-meal products; DSP) increased the number of both the root hair cells (trichoblasts) and hairless cells (atrichoblasts) of Brassica rapa by about 4.4 times and 1.9 times, respectively. To identify the root hair-promoting peptide(s) in DSP, the origin protein of the root hair-promoting peptide(s) was identified as Kunitz trypsin inhibitor (KTI). The root hair-promoting peptide in the degraded products of KTI was purified and produced a signal of 1,198.2 Da with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis. A search of the amino acid sequence of KTI located the peptide GGIRAAPTGNER, which had a molecular weight identical to 1,198.2 Da. The peptide GGIRAAPTGNER was chemically synthesized, and the synthetic peptide possessed root hair-promoting activity. Thus, it is concluded that this peptide in DSP is the foreign bioactive peptide promoting the differentiation of root hairs.