A vehicle door latch device comprising: an operation handle that is supported by a handle base provided in a door; a door latch mechanism that maintains said door in a closed state; a Bowden cable including an outer cable that is fixed at one end to said handle base and at the other end to said door latch mechanism, and an inner cable that is inserted into said outer cable while being coupled at one end to said operation handle and at the other end to a release lever of said door latch mechanism; and an elastic cap that has a cover portion in a cylindrical shape, extending in a movement direction of said inner cable to cover said inner cable extending from the one end of said outer cable, wherein said elastic cap includes an annular first projecting portion that is always in close contact with a part of said inner cable throughout its whole circumference in a circumferential direction, said annular first projecting portion is provided below said cover portion, and said elastic cap is filled with grease, wherein the Bowden cable includes an end cap fixed to the outer cable, wherein the end cap has an annular groove formed in an outer periphery of an upper end portion of the end cap; and the elastic cap has a fitting portion fixed to the end cap and the cover portion is formed on an upper side of the fitting portion, wherein the cover portion has a smaller diameter than the fitting portion, wherein the elastic cap includes a second annular projecting portion formed on an inner peripheral surface of the fitting portion, wherein the first annular projecting portion fixes the elastic cap to the end cap by being fitted onto the annular groove, and wherein the grease is put in a space formed between the fitting portion and the upper end of the end cap, and the inner cable passes through the grease in the space. an operation handle that is supported by a handle base provided in a door; a door latch mechanism that maintains said door in a closed state; a Bowden cable including an outer cable that is fixed at one end to said handle base and at the other end to said door latch mechanism, and an inner cable that is inserted into said outer cable while being coupled at one end to said operation handle and at the other end to a release lever of said door latch mechanism; and an elastic cap that has a cover portion in a cylindrical shape, extending in a movement direction of said inner cable to cover said inner cable extending from the one end of said outer cable, wherein said elastic cap includes an annular first projecting portion that is always in close contact with a part of said inner cable throughout its whole circumference in a circumferential direction, said annular first projecting portion is provided below said cover portion, and said elastic cap is filled with grease, wherein the Bowden cable includes an end cap fixed to the outer cable, wherein the end cap has an annular groove formed in an outer periphery of an upper end portion of the end cap; and the elastic cap has a fitting portion fixed to the end cap and the cover portion is formed on an upper side of the fitting portion, wherein the cover portion has a smaller diameter than the fitting portion, wherein the elastic cap includes a second annular projecting portion formed on an inner peripheral surface of the fitting portion, wherein the first annular projecting portion fixes the elastic cap to the end cap by being fitted onto the annular groove, and wherein the grease is put in a space formed between the fitting portion and the upper end of the end cap, and the inner cable passes through the grease in the space.