A study on the diagnosis of carcinoma of the stomach was carried out in 105 selected Korean cases of histologically proved carcinoma of the stomach, aimed to the position and value of roentgenography and gastroscopy. RESULTS : 1) In the diagnosis of 105 cases of Korean gastric carcinomas, a correct diagnosis was made by roentgenography in 79.1 % and by gastroscopy in 86.7 % of all cases. 2) In the diagnosis of carcinoma of the stomach, with roentgenography the greatest diagnostic erroroccured in primary ulcerative lesions and with gastroscopy in inadequate examinations which were resulted from mechanical failures. 3) In this series of 105 cases of Korean gastric carcinomas, two cases of early gastric carcinoma were correctly diagnosed by roetgenography and gastroscopy. 4) In this series, the most frequent type of gross pathology appeared to be Borrmann type III, the type of ulceration with spreading infiltration, which was 72.4% of all 105 cases and the site of the lesion revealed the highest frequency in the pylorus in 53.3 %, but both of these had little significance in the determination of diagnostic accuracy of roetgenography and/or gastroscopy in gastric carcinomas. 5) The onset of symptoms, clinical minifestations, and physical finsings were reviewed in all 105 cases of this series. 6) For the early detection of gastric carcinoma, the roentgenography must be chosen as first routine examination and the gastroscopy as second adjunctive method, because these two diagnostic procedures show no signoficant statistic defference on the diagnostic accuracy one another but the roentgenography has some advantages; its ease of performance, rapidity, greater safety, fewer contraindications to its use, its ease of re-examination, and fewer charge to the patient.