Storage box with improved fastening configuration

A storage box with improved fastening configuration, comprising:

• a container portion comprising:
• a lower main body;
• a lower recess formed on one surface of the lower main body;
• and
• a plurality of lug sets respectively located on different sides of the lower main body, and each of the lug sets comprising two lug parts, the two lug parts of each of the lug sets are spaced apart from each other, so that a gap is defined between the two lug parts, wherein a lower elongated slit is formed on one side of each of the two lug parts of each of the lug sets, and the lower elongated slits of the two lug parts of each of the lug sets are coaxial with each other and in communication with the corresponding gap between of the two lug parts;
• a lid portion comprising:
• an upper main body removably covering the container portion and the lower recess, and able to be completely detached from the lower main body;
• and
• a plurality of buckle pieces bendably connected to different sides of the upper main body, and respectively corresponding to the gaps of the lug sets, wherein each of the buckle pieces is formed with two upper elongated slits at two opposite sides thereof, and the upper elongated slits of each of the buckle pieces are coaxial with each other,
• wherein when the buckle pieces are respectively bent into the gaps of the lug sets, through the upper elongated slits of each of the buckle pieces are connected to the lower elongated slits of one of the lug sets, each of the buckle pieces is allowed to be abutted against the two lug parts of one of the lug sets, and the two lug parts of each of the lug sets are allowed to be abutted against one of the buckle pieces, respectively.