diff --git a/modules/relaidoBidAdapter.js b/modules/relaidoBidAdapter.js
index 0b2cdaa711e..880e826d75b 100644
--- a/modules/relaidoBidAdapter.js
+++ b/modules/relaidoBidAdapter.js
@@ -1,4 +1,4 @@
-import { deepAccess, logWarn, getBidIdParameter, parseQueryStringParameters, triggerPixel, generateUUID, isArray } from '../src/utils.js';
+import { deepAccess, logWarn, getBidIdParameter, parseQueryStringParameters, triggerPixel, generateUUID, isArray, isNumber } from '../src/utils.js';
 import { registerBidder } from '../src/adapters/bidderFactory.js';
 import { BANNER, VIDEO } from '../src/mediaTypes.js';
 import { Renderer } from '../src/Renderer.js';
@@ -6,7 +6,7 @@ import { getStorageManager } from '../src/storageManager.js';
 
 const BIDDER_CODE = 'relaido';
 const BIDDER_DOMAIN = 'api.relaido.jp';
-const ADAPTER_VERSION = '1.0.7';
+const ADAPTER_VERSION = '1.0.8';
 const DEFAULT_TTL = 300;
 const UUID_KEY = 'relaido_uuid';
 
@@ -44,7 +44,10 @@ function buildRequests(validBidRequests, bidderRequest) {
     let height = 0;
 
     if (hasVideoMediaType(bidRequest) && isVideoValid(bidRequest)) {
-      const playerSize = getValidSizes(deepAccess(bidRequest, 'mediaTypes.video.playerSize'));
+      let playerSize = getValidSizes(deepAccess(bidRequest, 'mediaTypes.video.playerSize'));
+      if (playerSize.length === 0) {
+        playerSize = getValidSizes(deepAccess(bidRequest, 'params.video.playerSize'));
+      }
       width = playerSize[0][0];
       height = playerSize[0][1];
       mediaType = VIDEO;
@@ -253,7 +256,10 @@ function isBannerValid(bid) {
 }
 
 function isVideoValid(bid) {
-  const playerSize = getValidSizes(deepAccess(bid, 'mediaTypes.video.playerSize'));
+  let playerSize = getValidSizes(deepAccess(bid, 'mediaTypes.video.playerSize'));
+  if (playerSize.length === 0) {
+    playerSize = getValidSizes(deepAccess(bid, 'params.video.playerSize'));
+  }
   if (playerSize.length > 0) {
     const context = deepAccess(bid, 'mediaTypes.video.context');
     if (context && context === 'outstream') {
@@ -300,6 +306,15 @@ function getValidSizes(sizes) {
         if ((width >= 300 && height >= 250)) {
           result.push([width, height]);
         }
+      } else if (isNumber(sizes[i])) {
+        const width = sizes[0];
+        const height = sizes[1];
+        if (width == 1 && height == 1) {
+          return [[1, 1]];
+        }
+        if ((width >= 300 && height >= 250)) {
+          return [[width, height]];
+        }
       }
     }
   }
diff --git a/test/spec/modules/relaidoBidAdapter_spec.js b/test/spec/modules/relaidoBidAdapter_spec.js
index cea49424b4d..ead44f96bc9 100644
--- a/test/spec/modules/relaidoBidAdapter_spec.js
+++ b/test/spec/modules/relaidoBidAdapter_spec.js
@@ -81,8 +81,8 @@ describe('RelaidoAdapter', function () {
       data: {
         bids: [{
           bidId: bidRequest.bidId,
-          width: bidRequest.mediaTypes.video.playerSize[0][0],
-          height: bidRequest.mediaTypes.video.playerSize[0][1],
+          width: bidRequest.mediaTypes.video.playerSize[0][0] || bidRequest.mediaTypes.video.playerSize[0],
+          height: bidRequest.mediaTypes.video.playerSize[0][1] || bidRequest.mediaTypes.video.playerSize[1],
           mediaType: 'video'}]
       }
     };
@@ -98,6 +98,33 @@ describe('RelaidoAdapter', function () {
       expect(spec.isBidRequestValid(bidRequest)).to.equal(true);
     });
 
+    it('should return true when not existed mediaTypes.video.playerSize and existed valid params.video.playerSize by video', function () {
+      bidRequest.mediaTypes = {
+        video: {
+          context: 'outstream'
+        }
+      };
+      bidRequest.params = {
+        placementId: '100000',
+        video: {
+          playerSize: [
+            [640, 360]
+          ]
+        }
+      };
+      expect(spec.isBidRequestValid(bidRequest)).to.equal(true);
+    });
+
+    it('should return even true when the playerSize is Array[Number, Number] by video', function () {
+      bidRequest.mediaTypes = {
+        video: {
+          context: 'outstream',
+          playerSize: [640, 360]
+        }
+      };
+      expect(spec.isBidRequestValid(bidRequest)).to.equal(true);
+    });
+
     it('should return true when the required params are passed by banner', function () {
       setUAMobile();
       bidRequest.mediaTypes = {