Fluid control apparatus and method for assembling the same

A fluid control apparatus comprising:

• a plurality of fluid control devices arranged side by side in a front and rear direction;
• a plurality of block-shaped joint members which are integrated with or separated from the fluid control devices;
• and
• seal means for ensuring sealing property at a portion where the joint members are abutted against one another, wherein
• each of the joint members is mounted to a base member through a male screw member from above, the joint members are abutted against one another and coupled to one another through a male screw member in the front and rear direction, a screw insertion hole extending in the front and rear direction has a stepped portion for receiving a head portion of the male screw member, and the stepped portion is provided closer to an inserted tip end of the male screw member in the front and rear direction than a position, in the front and rear direction, of the male screw members from above.