The aim of the present research program was to develop a strain of gastrointestinal bacteria containing antitumor substances. Fecal samples were collected from neonates and a number of gastrointestinal bacteria were isolated from the fecal samples by applying selective agar for intestinal bacteria. Among 127 isolates, a strain 2B4-1 containing an antitumor substance against stomach cancer, SNU-1, was selected. The strain 2B4-1 was identified as a strain similar to Enterococcus faecalis NCTC 775 with respect to morphological characteristics, growth temperature, salt and acid tolerance, growth under facultative anaerobic conditions and utilization of carbon sources such as arabinose and melibiose and so on. However, it showed some differences such as a negative reaction to hippurate hydrolysis and negative reaction to $eta$-hemolysis. We assigned to the strain 2B4-1 to Enterococcus faecalis.