Nagata Sōzaburō (永田宗三朗) was a Japanese company in the early 1940s. It is only known from the official list of set prices dated November 1941, where it is mentioned as the distributor or maker of the Meiro B, a camera which is otherwise unknown.
- "Kamera no kōtei kakaku kanpō happyō", November 1941, type 2, section 6B.
- "Kamera no kōtei kakaku kanpō happyō" (カメラの公定価格官報発表, Official announcement of the set prices of the cameras), November 1941. Extract of a table listing Japanese camera production and setting the retail prices, reproduced in "Bebī Semi Fāsuto 'Kore ha bebī wo nanotta semi-ki da'" (ベビーセミファースト"これはベビーを名乗ったセミ機だ", Baby Semi First, 'this is a Semi camera called Baby'), an article by Furukawa Yasuo (古川保男) in Camera Collectors' News no. 277 (July 2000). Nishinomiya: Camera Collectors News-sha. P. 27. Type 2, section 6B.