diff --git a/popup/mod_test.ts b/popup/mod_test.ts
index 01081b6..16115cd 100644
--- a/popup/mod_test.ts
+++ b/popup/mod_test.ts
@@ -105,5 +105,41 @@ test({
         },
       });
     }
+
+    await t.step({
+      name: `open() with relative cursor`,
+      fn: async () => {
+        await fn.append(denops, 0, [
+          "0123456789",
+          "0123456789",
+          "0123456789",
+          "0123456789",
+          "0123456789",
+          "0123456789",
+          "0123456789",
+          "0123456789",
+          "0123456789",
+          "0123456789",
+        ]);
+        await fn.cursor(denops, [5, 5]);
+
+        await using popupWindow = await popup.open(denops, {
+          relative: "cursor",
+          width: 20,
+          height: 20,
+          row: 3,
+          col: 3,
+          anchor: "NW",
+        });
+
+        assertEquals(await fn.win_gettype(denops, popupWindow.winid), "popup");
+        assertEquals(await fn.winwidth(denops, popupWindow.winid), 20);
+        assertEquals(await fn.winheight(denops, popupWindow.winid), 20);
+
+        const info = (await fn.getwininfo(denops, popupWindow.winid))[0];
+        assertEquals(info.winrow, 7, "winrow should be 7");
+        assertEquals(info.wincol, 7, "wincol should be 7");
+      },
+    });
   },
 });
diff --git a/popup/vim.ts b/popup/vim.ts
index f9db6ec..605f95d 100644
--- a/popup/vim.ts
+++ b/popup/vim.ts
@@ -37,12 +37,30 @@ function toPopupCreateOptions(
   };
 }
 
+function handleRelative(
+  relative: "editor" | "cursor",
+  offset: number,
+): string | number {
+  switch (relative) {
+    case "editor":
+      return offset;
+    case "cursor":
+      return offset < 0 ? `cursor${offset}` : `cursor+${offset}`;
+    default:
+      unreachable(relative);
+  }
+}
+
 function toPopupSetOptionsOptions(
   options: Partial<Omit<OpenOptions, "bufnr" | "noRedraw">>,
 ): vimFn.PopupSetOptionsOptions {
   const v: vimFn.PopupCreateOptions = {
-    line: options.row,
-    col: options.col,
+    line: options.row
+      ? handleRelative(options.relative ?? "editor", options.row)
+      : undefined,
+    col: options.col
+      ? handleRelative(options.relative ?? "editor", options.col)
+      : undefined,
     pos: options.anchor ? posFromAnchor(options.anchor) : undefined,
     fixed: true, // To keep consistent with the behavior of Neovim's floating window
     flip: false, // To keep consistent with the behavior of Neovim's floating window