Kobayashi's rapid, systematic move into the Tokyo market, unprecedented in the industry, became the base of their post-war development, but their other branch office expansion cannot be overlooked. The Kobe branch in December, 1947, Yokohama in January, 1950, and Kyoto in May were established. 1951 was Shinjuku in April and Hiroshima in July, and 1955 was Ooi in January. During the late40's/50's, Osaka Head office and Tokyo Kobayashi Daiyakubo opened three stores each.

Sales in the suburban areas till then had consisted of taking a train to the nearest station, and visiting clients by bicycle. In outlying areas, salesmen would fill their backpack with samples, stay at local inns and make rounds collecting orders. Merchandise would be sent later by train or shipping. They would visit once a month, as much as possible, but in spite of all this effort, relationships with clients would weaken. Added to that, modes of travel were in a terrible state due to the post-war disorder at the time. It was not easy to get train tickets, and it was not unusual to wait in line all night for them. Even if it was possible to get on a train, people would force themselves onto already jam-packed trains, or jump in through the windows. The train stations were always in an uproar, like a disaster scene. Then, it might not even be possible to get off the train at the correct destination due to the rush-hour crowd, and could end up going right past it.

With these conditions, it was impossible to achieve adequate sales activity. Though other companies were in the same position, and even though capital was in short supply in those times, Saburo immediately dove into branch office expansion.

With these offices as home-base, there was no longer a need to struggle onto the crowded trains, and salesmen could finally invest all of their energy into their work.