SLIM (Smart Lander for Investigating Moon) of ISAS/JAXA is a demonstration mission of lunar pinpoint landing technology with a small spacecraft. The navigation cameras of SLIM require the function of the so-called global shutter in order to take lunar surface images under high orbital velocity. Since the requirement of miniaturization is also critical, we decide to use the commercial CMOS image sensor for the SLIM cameras. The package of the selected CMOS image sensor is the 48-pin CLCC (Ceramic Leadless Chip Carrier). It is known that there are some matters of concerns about reliability of the CLCC solder joints when applied to space missions. So the detailed results of thermal cycle tests for the CLCC packages soldered on the substrates are described in this paper. Several counterplans to improve the robustness of the solder joints are investigated from the substrates and the solders to the pad pattern. From the results of the thermal cycles tests, it is confirmed that the most promising approach to solder the CLCC packages without the significant cracks is to select adequate substrate materials with coefficients of thermal expansion similar to the ceramic.