Pembelajaran bahasa asing dalam sebuah materi ajar sangat mengutamakan pengenalan pembendaharaan kosakata. Dalam pembelajaran bahasa Jepang di tingkat Sekolah Menengah Atas, budaya Jepang turut dipelajari dengan tujuan sebagai pengenalan dan peningkatan wawasan budaya. Beberapa kosakata benda perlu dipahami agar mempermudah dalam mempelajari budaya khas Jepang. Media pembelajaran memiliki peranan penting dalam menyampaikan materi ajar, media realia menjadi pilahan yang dianggap dapat meningkatkan penguasaan kosakata bahasa Jepang. Penelitian ini menggunakan metode kuantitatif eksperimen, dengan populasi siswa SMA Negeri 1 Lembang tahun ajaran 2015/2016. Sampel dipilih secara acak dengan jumlah 84 orang yaitu X MIA 2 sebagai kelas eksperimen dan X MIA 3 sebagai kelas kontrol. Analisis data menggunakan instrumen tes awal (pretest), tes akhir (posttest) dan angket. Hasil analisis data menunjukkan, nilai rata-rata siswa sebelum menggunakan media realia pada kelas eksperimen 30,48, pada kelas kontrol 27,69. Setelah menggunakan media realia nilai rata-rata kelas eksperimen menjadi 78,02, pada kelas kontrol 59,90. Perhitungan statistik komparasional, sebelum menggunakan media realia t hitung lebih kecil dari t tabel yaitu 1,222,64. Setelah menggunakan realia nilai t hitung lebih besar dari t tabel yaitu 7,522,64. Hal tersebut menyatakan ada perbedaan yang signifikan pada kelas eksperimen dan kelas kontrol setelah menggunakan media realia. Hasil angket menunjukkan persentase sebesar 76%-95% (sebagian besar) responden memberikan tanggapan positif mengenai pembelajaran dengan media realia. Penggunaan media realia sangat efektif dalam meningkatkan penguasaan kosakata benda yang berkaiatan dengan budaya khas Jepang.   The learning of foreign language in a learning material is prioritizing the introduction of vocabularies. In the Japanese language learning at the high school level, Japanese cultures are taught with the purpose of introducing and enhancing students’ cultural insight. Some objects vocabularies are needed to be understood in order to make ease students to learn Japanese typical cultures. The first observation conducted in this research shows that the Japanese vocabularies learning is difficult to be learnt by using book as the media of learning. Learning media has an important role in delivering learning material. Realia becomes the alternative media to enhance students in mastering Japanese vocabularies. This research employed the true experimental quantitative methods with the population of students in SMA NEGERI 1 LEMBANG in the academic year 2015/2016. The sample of this research were selected randomly with 84 students employed both as the experimental class in X MIA 2 and X MIA 3 as the control class. The instruments used in the data analysis were prettest, posttest and questionaires.The data analysis shows that the average score of students before using Realia as the learning media in the experimental class was 30.48 and 27.69 in the control class. After realia was used as the learning media, the average score of the experimental class increases until 78.20 and 59.90 in the control class. Meanwhile, the t calculation of comparational statistic calculation before using realia was smaller than the t table which is 1.222.64. After using realia as the learning media the t score became greater than t table which is 7.52 2.64. It shows that there is a significant difference between experimental class and control class after using realia as the learning media. The questionnaire results shows that 76% -95% (most) of the respondents give positive feedback towards the learning with using realia as the media of learning. The use of realia as the media of learning is very effective in improving the mastery of objects vocabularies relating to the typical culture of Japan.