The purposes of this research were 1) to develop the Japanese online lessons using self-directed learning for grade 10 students, 2) to evaluate the quality of the Japanese online lessons using self-directed learning for grade 10 students, 3) to compare the learning achievement of the students before and after learning with Japanese online lessons using self-directed learning, and 4) to find the satisfaction of students on the Japanese online lessons using self-directed learning. The sample group used in this research was 19 students of grade 10 students at Satthasamut School. The purposive sampling technique was used. The instruments used in this research were the Japanese online lessons, the assessment form of the content, the assessment form of the techniques and methodology, the learning achievement test, and the assessment form of student satisfaction. The data were analyzed using mean, standard deviation, and dependent t–test.

The research findings showed that: 1) the Japanese online lessons using self-directed learning that developed was consisted of 3 units including introduction to Japanese 1, Japanese identification of things and people, and direction and location indications, 2) the opinion of the content experts and the opinion of the technique and methodology experts on the Japanese online lessons using self-directed learning were at the highest level, 3) the students who studied with the Japanese online lessons using self-directed learning had post-test scores higher than pre-test scores at .05 significance level, and 4) the students' satisfaction with the Japanese online lessons using self-directed learning was at the highest level.