Twenty-two soldiers made it back to their base at Ouallam in three vehicles, while the rest were unaccounted for, it said, citing local and security sources.
This is the same region where four American and five Niger soldiers were killed in a jihadist attack in October 2017.
Niger is one of a number of poor, fragile countries in the Sahel region that have been hit by a jihadist revolt.
Different jihadist groups operate in the country’s west and north, and Boko Haram from Nigeria in its southeast.
The country is part of the so-called G5 Sahel group set up to manage a coordinated response to the jihadist insurgency.