Abstrak: Penelitian ini menghasilkan produk berupa buku ajar berbasis infografis pada tema 5 ekosistem subtema 1 komponen ekosistem pada kelas 5 SD. Jenis penelitian yang digunakan adalah penelitian R&D (research and development). Kelayakan produk buku ajar berbasis infografis diukur berdasarkan validitas buku, efektivitas buku dan respons siswa. Subjek uji coba penelitian ini adalah siswa kelas VD SDN Jember Lor 01, siswa kelas VA SDN Jember Lor 02 dan siswa kelas V Ustman SDIT Harapan Umat. Metode pengumpulan data yang digunakan ialah validasi dan kueisioner. Berdasarkan hasil analisis validasi didapatkan persentase dari validator ahli sebesar 92,6% dan dapat dikatakan sangat valid. Keefektivitasan buku ajar berdasarkan angket hasil belajar siswa didapatkan persentase sebesar 80%, 82% dan 84%. Buku ajar infografis mendapat respons positif dengan persentase 100%, 100% dan 97,7%. Berdasarkan hasil tersebut buku ajar berbasis infografis sudah memenuhi aspek untuk dapat digunakan sebagai buku ajar.INFOGRAPHIC BASED TEXTBOOK DEVELOPMENT IN THE ECOSYSTEM THEME TO IMPROVE STUDENT LEARNING OUTCOMES IN 5TH CLASS ELEMENTARY SCHOOLAbstract: This research developed an infographic-based textbook on subtheme 1: ecosystem component of theme 5: an ecosystem in 5th grade of elementary school. The research type used R&D (research and development). Infographic-based textbook’s properness measured by book validation, book effectivity, and students’ responses. The subject of this research was V grade students D class from SDN Jember Lor 01, V grade students B class from SDN Jember 02, and V grade student Ustman class from SDIT Harapan umat. This research used validation and questionnaire as data collection methods. From the data analysis, the percentage obtained from validator was 92,6%, and it could be concluded as very valid. The infographic-based textbook effectivity based on student learning outcomes questionnaire, the percentage that obtained were 80%, 82%, and 84%. The infographic-based textbook got a positive response, with a percentage of 100%, 100%, and 97,7%. From the result, an infographic-based textbook fulfilled aspect to be used as a textbook.