Chad is taking part in a regional offensive against the Nigeria-based Islamist radicals along with troops from Nigeria, Niger and Cameroon.
Chad army chief General Brahim Seid told reporters in N'Djamena the "valiant soldiers" had died since February 3 in the "just and noble cause of bringing peace and security" to the region.
The countries neighbouring Nigeria, including Chad, sent troops to help crush Boko Haram after the Islamists began to threaten the region surrounding Lake Chad, where the borders of all four nations converge.
The UN yesterday launched an appeal for USD 174 million to give "life-saving aid" to the almost 200,000 Nigerians who have fled the country due to the group's brutal attacks.