Disclosed is a particulate collecting filter structure for a diesel engine. The filter structure includes a plurality of through cells axially and regularly arranged therein. The through cells are partitioned by thin cell walls. Half of the through cells are sealed by a sealant at outflow ends thereof, and the remaining half of the through cells are opened at outflow ends thereof. The filter structure is provided in the diesel engine to solve conventional problems caused by pressure loss. It is possible to avoid the problems in which operating conditions and fuel consumption efficiency are worsened, convenience of operation is reduced, and, at worst, operation of the engine is stopped, because overstrain is applied to the mechanically controlled diesel engine.