Exhaust emission control device for internal combustion engine

An exhaust emission control device for an internal combustion engine comprising

• a plurality of reed valve chambers respectively including reed valves, and provided to a cylinder head portion of a multi-cylinder internal combustion engine,
• the reed valve chambers being formed by covering recessed portions provided to the cylinder head portion respectively with reed valve covers, and
• the reed valve chambers having upstream sides which communicate with the atmosphere via a separate secondary air supply pipe provided to the cylinder head portion;
• and downstream sides which communicate with exhaust ports via communication passages provided to the cylinder head portion, and
• the reed valves being interposed between the upstream sides and the downstream sides of the reed valve chambers, and the reed valves being opened by exhaust pulsation pressure, wherein
• in the cylinder head portion, the plurality of reed valve chambers are disposed with spaces therebetween,
• the plurality of reed valve covers communicate individually with the secondary air supply pipe, and the reed valve covers are connected in series by the secondary air supply pipe, and
• the plurality reed valve covers are integrally formed with the secondary air supply pipe into an integrated passage-cover unit that is releasably connected to the cylinder head portion and covered by a cylinder head cover.