A production method of a cross-linked fluororubber product, comprising the steps of: previously polyol-crosslinking, as required: a fluororubber composition comprising: a polyol-crosslinkable fluororubber; a cross-linking accelerator comprising a quaternary ammonium salt of the general formula, wherein R represents an alkyl group having a carbon number of 1 to 24 or an aralkyl group having a carbon number of 7 to 20, and X - represents a tetrafluoroborate group; and a polyol crosslinking agent;; wherein the weight ratio X (quaternary ammonium salt/polyol crosslinking agent) between the cross-linking accelerator and the polyol crosslinking agent is in a range of 0.43 to 0.57; and subsequently heat treating the polyol-crosslinked composition, in a temperature range of 240°C to 260°C for 0.1 to 48 hours; wherein the cross-linked fluororubber product produced according to the said production method has a dynamic friction coefficient of 0.1 to 0. 4 (in conformity to JIS K7125, P 8147), a surface roughness (Ra) of 1.5 to 4.0, and a surface roughness (Ry) of 10 to 25 (both in conformity to JIS B-0601). A production method of a cross-linked fluororubber product, comprising the steps of: previously polyol-crosslinking, as required: a fluororubber composition comprising: a polyol-crosslinkable fluororubber; a cross-linking accelerator comprising a quaternary ammonium salt of the general formula, wherein R represents an alkyl group having a carbon number of 1 to 24 or an aralkyl group having a carbon number of 7 to 20, and X - represents a tetrafluoroborate group; and a polyol crosslinking agent;; wherein the weight ratio X (quaternary ammonium salt/polyol crosslinking agent) between the cross-linking accelerator and the polyol crosslinking agent is in a range of 0.43 to 0.57; and subsequently heat treating the polyol-crosslinked composition, in a temperature range of 240°C to 260°C for 0.1 to 48 hours; wherein the cross-linked fluororubber product produced according to the said production method has a dynamic friction coefficient of 0.1 to 0. 4 (in conformity to JIS K7125, P 8147), a surface roughness (Ra) of 1.5 to 4.0, and a surface roughness (Ry) of 10 to 25 (both in conformity to JIS B-0601). previously polyol-crosslinking, as required: a fluororubber composition comprising: a polyol-crosslinkable fluororubber; a cross-linking accelerator comprising a quaternary ammonium salt of the general formula, wherein R represents an alkyl group having a carbon number of 1 to 24 or an aralkyl group having a carbon number of 7 to 20, and X - represents a tetrafluoroborate group; and a polyol crosslinking agent;; wherein the weight ratio X (quaternary ammonium salt/polyol crosslinking agent) between the cross-linking accelerator and the polyol crosslinking agent is in a range of 0.43 to 0.57; and subsequently heat treating the polyol-crosslinked composition, in a temperature range of 240°C to 260°C for 0.1 to 48 hours; wherein the cross-linked fluororubber product produced according to the said production method has a dynamic friction coefficient of 0.1 to 0. 4 (in conformity to JIS K7125, P 8147), a surface roughness (Ra) of 1.5 to 4.0, and a surface roughness (Ry) of 10 to 25 (both in conformity to JIS B-0601). a fluororubber composition comprising: a polyol-crosslinkable fluororubber; a cross-linking accelerator comprising a quaternary ammonium salt of the general formula, wherein R represents an alkyl group having a carbon number of 1 to 24 or an aralkyl group having a carbon number of 7 to 20, and X - represents a tetrafluoroborate group; and a polyol crosslinking agent;; wherein the weight ratio X (quaternary ammonium salt/polyol crosslinking agent) between the cross-linking accelerator and the polyol crosslinking agent is in a range of 0.43 to 0.57; and subsequently heat treating the polyol-crosslinked composition, in a temperature range of 240°C to 260°C for 0.1 to 48 hours; wherein the cross-linked fluororubber product produced according to the said production method has a dynamic friction coefficient of 0.1 to 0. 4 (in conformity to JIS K7125, P 8147), a surface roughness (Ra) of 1.5 to 4.0, and a surface roughness (Ry) of 10 to 25 (both in conformity to JIS B-0601). a polyol-crosslinkable fluororubber; a cross-linking accelerator comprising a quaternary ammonium salt of the general formula, wherein R represents an alkyl group having a carbon number of 1 to 24 or an aralkyl group having a carbon number of 7 to 20, and X - represents a tetrafluoroborate group; and a polyol crosslinking agent;; wherein the weight ratio X (quaternary ammonium salt/polyol crosslinking agent) between the cross-linking accelerator and the polyol crosslinking agent is in a range of 0.43 to 0.57; and subsequently heat treating the polyol-crosslinked composition, in a temperature range of 240°C to 260°C for 0.1 to 48 hours; wherein the cross-linked fluororubber product produced according to the said production method has a dynamic friction coefficient of 0.1 to 0. 4 (in conformity to JIS K7125, P 8147), a surface roughness (Ra) of 1.5 to 4.0, and a surface roughness (Ry) of 10 to 25 (both in conformity to JIS B-0601).